Verifying Free space in Flash

Hi everyone,
I am trying to upgrade IOS on WS-C3750G-24T to c3750-ipservicesk9-mz.150-2.SE5.bin
I was getting error
%Error writing flash:/c3750-ipservicesk9-mz.150-2.SE5.bin (No space left on devi
ce)
So i deleted the old ios from the flash
witch#sh flash
Directory of flash:/
    3 -rwx         616   Mar 1 1993 00:14:02 +00:00 vlan.dat
    7 -rwx          24   Mar 1 1993 00:16:49 +00:00 private-config.text
    8 -rwx        2072   Mar 1 1993 00:16:49 +00:00 multiple-fs
15998976 bytes total (15993856 bytes free)
New IOS is 17.42MB.
Need to verify that total space on flash is 15998976 ???
Regards
MAhesh

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Posting
Really early 3750s only had 16 MB of flash, so you're going to be unable to load a 17 MB image.

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FREE LIST와 FREE SPACE관리

제품 : ORACLE SERVER
작성날짜 : 1995-11-06
* Free List 는 해당 세그먼트가 다시 사용할 수 있는 block에 관한 list 이다.
Free Block이 추가될 때는 Free List의 Head에 덧붙여진다. 예를 들면 Block B5
가 Free List FL 에 있고 다른 B6 block이 FL에 덧붙여질 때
FL : B6 -> B5
즉 B6 가 free block으로 먼저 쓰여진다.
앞으로 사용할 약어 : V1(V6.0 ~ V6.0.34)
V2(V.6.0.35 ~ V7)
* Free List 에는 다음과 같은 것들이 있다.
. Txfl(Transaction Free List) : 모든 트랜잭션에 할당되는 Free List이다.
한 세그먼트에는 최소 16 Txfl 이 있고 이는 블럭이 꽉 찰 때 까지 필요한
만큼 증가한다. 모든 프로세스는 해당 인스턴스에 주어진 Txfl에 접근 할 수
있다.
. Prfl(Process Free List) : 하나의 프로세스에 할당되는 Free List 이다.
하나의 프로세스는 다른 프로세스에 할당 되어진 Prfl 을 사용하지 않는다.
. Sgfl(Segment Free List) : Prfl과 같다.
. Msfl(Master Free List) : 모든 프로세스가 사용 할 수 있도록 미리 할당
되어진 Prfl이다.
<V1 에서의 Segment Header의 Block Format>
* 세그먼트는 연속된 블럭의 모음인 익스텐트로 구성 되어 있다. 세그먼트가
생성될때 첫번째 익스텐트의 첫번째 블럭을 Segment Header라고 한다.
Segment Header는 Extent Control, Extent Map Table, Segment Header,Segment
Free Space, Transaction Free Space로 이루어져 있다. Extent Control과
Extent Map Table은 세그먼트에 할당된 익스텐트에 관한 정보를 준다. Segment
Header Control은 Transaction Free List 정보와 세그먼트가 생성 될 때 명시된
Instance List(nfb)와 Process Free List(nfl)의 갯수를 가지고 있다.
* Instance Free List(infl) 갯수는 디폴트가 1이며 1보다 클 경우 Prfl의
갯수는 Prfl/Sgfl = nfb * nfl 이다. nfb는 init<SID>.ora 의 free_list_inst,
nfl은 free_list_proc 에서 지정된다.
<V1 과 V2 에서의 Block Format 차이점>
* V6.0.35 에서는 기존의 Block Type 5에 Block Type 12가 추가됨으로써 Segment
Header는 Type 5 또는 12가 가능하다. 이의 구별은 명시된 Free Group의 갯수에
의해 결정된다. 즉, Free Group의 갯수가 1보다 크면 Segment Header의 block
Type은 12로 설정된다.
* V6.0.35 이상에서는 Free Lists 의 관련 정보를 Storage 항에서 표시할 수
있다.
....storage (freelists n freelist groups m)
장점은 데이타 딕셔너리에 Free List의 정보가 저장 되어진다는 것이다. 즉
V1 에서 처럼 Free Lists 를 바꾸기 위해 데이타베이스를 Restartup 할
필요가 없다.
* V1 에서는 Freelists를 위해 Segment Header인 한 블럭이 할당된다. 그러나 V2
에서는 각 Free List Group 에 한개의 Free List Block 이 존재한다. 예를
들어, M=2 이면 Segment Header와 다음 2 block 이 할당 되어지는데 각 블럭은
Free List Group을 위한 것이다. ( 여기서 M 은 Free Group 이다).
< Mapping Function 과 Free Space 검색 알고리즘>
(Mapping Function)
* Mapping Function은 단순히 Thread Number % Freelist Groups 와 Process
Number % Process Freelists이다. 예를 들어 M=3,N=5는 3개의 Free List Groups
와 각각은 5개의 Process Free List 를 가짐을 의미한다.
1(1 2 3 4 5) 2(1 2 3 4 5) 3(1 2 3 4 5)
. 임의의 프로세스가 인스턴스 2 에 접속되어 있고 Thread Number는 10 이고
Process Number는 26 이라고 가정하면 어떤 Freelist 가 할당되어질까?
이런 경우에는
10 % 3 = 1
26 % 5 = 1
즉, 첫번째 그룹의 첫번째 Prfl 을 선택하게 된다.
* 만약 인스턴스를 특정한 Freelist Block에 할당하고자 할 때는 init<SID>.ora
Parameter 인 Instance_number를 이용한다.
(검색 알고리즘)
* V6.04 이하에서는 다음 순서를 따른다.
1. 자신의 Transaction Free List에서 Free List를 찾는다. 찾으면 #7, 아니면
#2로 간다.
2. Process Freelist 의 Free Space 를 찾는다. 찾으면 #7, 아니면 #3 으로간다.
3. Commit된 Txfls를 찾는다. 만일 Commit되지 않은 Txfl Space를 발견하면 #4로
가고 아니면 각 Commit된 Txfl Space 를 한 Prfl에 할당한다. 만약 Prfl >
Trfl 이면 어떤 Prfl는 Space를 얻지 못하고 Prfl < Trfl 이면 어떤 Prfl은
보다 많은 Space를 얻으며 #2 로 간다.
4. High Water Mark를 Bump Up할 수 없으면 #5로 가고 가능하면 원래대로
Space를 Prfl에 복사한 후 #2로 간다.
5. 데이타 딕셔너리에서 fet$를 검색하고 익스텐트를 세그먼트에 할당하고 #4로
간다. 만일 fet$ 에 Space 가 없으면 #6로 간다.
6. 에러발생. 테이블스페이스에 더이상 Space 가 없다.
7. Space 를 사용한다.
* V6.0.35 이상에서는 다음 순서에 의한다.
1. 자신의 Transaction Free List에서 Free List를 찾는다. 찾으면 #8, 아니면
#2 로 간다.
2. Process Freelist 의 Free Space 를 찾는다. 찾으면 #8, 아니면 #3 으로
간다.
3. Master Freelist를 검색한다. 만일 Space를 찾으면 Prfl에 Space의 조각을
복사하고 #2, 아니면 4로 간다.
4. Commit된 Txfls를 찾는다. 만일 Commit되지 않은 Txfl Space를 발견하면 #5,
아니면 각 Commit된 Txfl Space 를 Master Freelist 에 복사하고 #3으로간다.
5. High Water Mark 를 Bump Up할 수 없으면 #6으로 가고 가능하면 Bump Up하고
Space를 Prfl 에 복사한 후 #2로 간다.
6. 데이타 딕셔너리에서 fet$를 검색하고 익스텐트를 세그먼트에 할당하고 #4로
간다. 만일 fet$ 에 Space 가 없으면 #7로 간다.
7. 에러 발생 테이블스페이스에 더 이상 Space 가 없다.
8. Space 를 사용한다.

Hi sachin22,
Welcome to the forum!
Upon verifying from the Windows Phone Store website, the apps that you mentioned (which are all from XBox) are tagged as paid apps. You can visit the website and search the apps to verify it: windowsphone.com However, aside from these apps, are you able to find other free apps from the Store, like those that are published by Nokia? Also, you installed the free version of these apps via SD card (using XAP app installers), is that right?
By the way, when you say 'flashing', do you mean recovering the phone's OS using the
Nokia Software Recovery tool as shown at this link: FAQ's - Nokia Software Recovery tool
Hope to hear feedback from you soon.

SLOW MAC: Why does my mac run faster during the "erase free space" operation?

Hi community!
So I've been using my Macbook Pro Late 2012 edition for just over a year and a half now, and to no surprise, I find the spinning beachball whirling away more often than I'd care to see it. So I start a full mac clean-up including deleting login items, using Appzapper to clear up my apps, using Onyx to clear up some cache elements, deleting unused files and freeing up hard drive space.
I've successfully cleared over 60% of disk space, (200GB used, 300GB free), but I find a recurring problem persisting, despite my best efforts to get rid of it. You see, every few seconds, the spinning beach ball appears and freezes up my entire desktop no matter what I'm doing. Trying even the simplest things, like opening the apps in the dock or right clicking a file takes ages, movies freeze up all the time, regardless of what app plays them, finder is slow and it has nothing to do with my ram usage (I use the app FreeMemory to check in real-time how much I'm using) or my CPU usage (Activity monitor open at all times). It has to be the drive.
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Now, during all these stages I was regularly running erase free space opeartions (Fast x1), and noticed something curious: during the operation, my problem disappears. I still get occasional loading beach balls, and ocassional jumps in movies, but other than that, I can use my mac normally again.
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I've tried defragging, to no avail.
I had the problem on Mountain Lion, and upgraded to Mavericks thinking that could change it (by the way it took 18 hours to install mavericks, don't know if that's related).
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EtreCheck version: 1.9.12 (48)
Report generated 17 Jun 2014 08:24:26 GMT+2
Hardware Information:
          MacBook Pro (13-inch, Mid 2012) (Verified)
          MacBook Pro - model: MacBookPro9,2
          1 2.5 GHz Intel Core i5 CPU: 2 cores
          4 GB RAM
Video Information:
          Intel HD Graphics 4000 - VRAM: (null)
                    Color LCD 1280 x 800
System Software:
          OS X 10.9.3 (13D65) - Uptime: 1 day 0:37:38
Disk Information:
          APPLE HDD TOSHIBA MK5065GSXF disk0 : (500,11 GB)
                    EFI (disk0s1) <not mounted>: 209,7 MB
                    Macintosh HD (disk0s2) / [Startup]: 499,25 GB (287,47 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          OPTIARC DVD RW AD-5970H
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Configuration files:
          /etc/hosts - Count: 15
Gatekeeper:
          Anywhere
Kernel Extensions:
          [loaded] com.Cycling74.driver.Soundflower (1.6.2 - SDK 10.6) Support
          [not loaded] com.anchorfree.tun (1.1.1 - SDK 10.8) Support
          [not loaded] com.iospirit.driver.RBTSRPlugin (1.18 - SDK 10.6) Support
          [loaded] com.iospirit.driver.rbiokithelper (1.21 - SDK 10.6) Support
          [loaded] com.manycamllc.driver.ManyCamDriver (0.0.9 - SDK 10.5) Support
          [not loaded] com.paceap.kext.pacesupport.leopard (5.8 - SDK 10.4) Support
          [not loaded] com.paceap.kext.pacesupport.master (5.8) Support
          [not loaded] com.paceap.kext.pacesupport.panther (5.8 - SDK 10.3) Support
          [loaded] com.paceap.kext.pacesupport.snowleopard (5.8 - SDK 10.6) Support
          [not loaded] com.paceap.kext.pacesupport.tiger (5.8 - SDK 10.4) Support
          [not loaded] com.roxio.BluRaySupport (1.1.6) Support
          [not loaded] com.roxio.TDIXController (2.0) Support
          [loaded] com.waves.driver.soundgrid (2.0.0) Support
          [loaded] net.osculator.driver.OSCulatorIOKit (2.0 - SDK 10.5) Support
          [loaded] org.virtualbox.kext.VBoxDrv (4.2.16) Support
          [not loaded] org.virtualbox.kext.VBoxNetAdp (4.2.16) Support
          [not loaded] org.virtualbox.kext.VBoxNetFlt (4.2.16) Support
          [loaded] org.virtualbox.kext.VBoxUSB (4.2.16) Support
Startup Items:
          PACESupport: Path: /Library/StartupItems/PACESupport
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist Support
          [loaded] com.adobe.SwitchBoard.plist Support
          [loaded] com.anchorfree.ajaxserver.plist Support
          [loaded] com.google.keystone.daemon.plist Support
          [loaded] com.iospirit.candelair.daemon.plist Support
          [loaded] com.iospirit.candelair.sync.plist Support
          [loaded] com.microsoft.office.licensing.helper.plist Support
          [running] com.paceap.eden.licensed.plist Support
          [running] com.waves.daemon.SoundGridProtocolService.plist Support
          [loaded] net.sourceforge.MonolingualHelper.plist Support
          [loaded] org.macosforge.xquartz.privileged_startx.plist Support
          [loaded] PACESupport.plist Support
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist Support
          [loaded] com.adobe.CS5ServiceManager.plist Support
          [loaded] com.google.keystone.agent.plist Support
          [running] net.culater.SIMBL.Agent.plist Support
          [loaded] org.macosforge.xquartz.startx.plist Support
          [running] org.tigris.scplugin.launch.plist Support
User Launch Agents:
          [loaded] com.facebook.videochat.[redacted].plist Support
          [not loaded] org.virtualbox.vboxwebsrv.plist Support
User Login Items:
          iTunesHelper
Internet Plug-ins:
          Flip4Mac WMV Plugin: Version: 3.0.0.126   - SDK 10.8 Support
          FlashPlayer-10.6: Version: 13.0.0.214 - SDK 10.6 Support
          Default Browser: Version: 537 - SDK 10.9
          Flash Player: Version: 13.0.0.214 - SDK 10.6 Outdated! Update
          QuickTime Plugin: Version: 7.7.3
          o1dbrowserplugin: Version: 5.4.2.18903 Support
          zako: Version: zako 1.0.0.0 - SDK 10.8 Support
          SharePointBrowserPlugin: Version: 14.0.0 Support
          googletalkbrowserplugin: Version: 5.4.2.18903 Support
          Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
          JavaAppletPlugin: Version: Java 7 Update 21 Check version
Safari Extensions:
          ChatZum: Version: 1.31
          AdBlock: Version: 2.6.0
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 2.0 - SDK 10.9
          AppleAVBAudio: Version: 203.2 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
          Kaleidostrobe: Version: 1.0.0 ©2002 Shehryar Lasi
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins:
          BlueStacks Install Detector: Version: Unknown
          Google Earth Web Plug-in: Version: 7.1 Support
3rd Party Preference Panes:
          Flash Player Support
          Flip4Mac WMV Support
          Growl Support
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               3%          SGProtocolService
               2%          codesign
               2%          VLC
               1%          coreaudiod
               1%          CVMCompiler
Top Processes by Memory:
          131 MB          VLC
          131 MB          com.apple.IconServicesAgent
          127 MB          Google Chrome
          111 MB          mds_stores
          60 MB          WindowServer
Virtual Memory Information:
          1.23 GB          Free RAM
          1.15 GB          Active RAM
          913 MB          Inactive RAM
          661 MB          Wired RAM
          2.61 GB          Page-ins
          96 MB          Page-outs
Any clues?

Logical Volume Group and Logical Partition not matching up in free space

I was dual booting Windows 7 and Mountain Lion. Through Disk Utility, I removed the Windows 7 Partition and expanded the HFS+ partition to encompass the entire hard drive. However, the Logical Volume Group does not think that I have that extra free space. The main problem is that I cannot resize my partition. I am wanting to dual boot Ubuntu with this. Any ideas? Any help is appreciated. I will post some screenshots with the details. Furthermore, here are some terminal commands I ran: /dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_CoreStorage 249.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MAC OS X *248.9 GB disk1 Filesystem 1024-blocks Used Available Capacity iused ifree %iused Mounted on
/dev/disk1 243031288 153028624 89746664 64% 38321154 22436666 63% /
devfs 189 189 0 100% 655 0 100% /dev
map -hosts 0 0 0 100% 0 0 100% /net
map auto_home 0 0 0 100% 0 0 100% /home CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 52A4D825-B134-4C33-AC8B-39A02BA30522
=========================================================
Name: MAC OS X
Size: 249199587328 B (249.2 GB)
Free Space: 16777216 B (16.8 MB)
|
+-< Physical Volume 6D7A0A36-1D86-4A30-8EB5-755D375369D9
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 249199587328 B (249.2 GB)
|
+-> Logical Volume Family FDC4568F-4E25-46AB-885A-CBA6287309B6
Encryption Status: Unlocked
Encryption Type: None
Conversion Status: Converting
Conversion Direction: backward
Has Encrypted Extents: Yes
Fully Secure: No
Passphrase Required: No
|
+-> Logical Volume BB2662B7-58F3-401C-B889-F264D79E68B4
Disk: disk1
Status: Online
Size (Total): 248864038912 B (248.9 GB)
Size (Converted): 130367356928 B (130.4 GB)
Revertible: Yes (unlock and decryption required)
LV Name: MAC OS X
Volume Name: MAC OS X
Content Hint: Apple_HFS

Here is another try via the command line:
dhcp-10-201-238-248:~ KyleWLawrence$ diskutil coreStorage resizeVolume BB2662B7-58F3-401C-B889-F264D79E68B4 210g
Started CoreStorage operation
Checking file system
Performing live verification
Checking Journaled HFS Plus volume
Checking extents overflow file
Checking catalog file
Incorrect block count for file 2012.12.11.asl
(It should be 390 instead of 195)
Checking multi-linked files
Checking catalog hierarchy
Checking extended attributes file
Checking volume bitmap
Checking volume information
Invalid volume free block count
(It should be 21713521 instead of 21713716)
The volume MAC OS X was found corrupt and needs to be repaired
Error: -69845: File system verify or repair failed

Internal Hard Drive Free Space Issue

Hey,
I recently upgraded my 17" MacBook Pro from Tiger to Snow Leopard but the upgrade seems to have created a number of problems, the most notable being the lack of free space now available on my internal hard drive.
I also had to install a trial version of Aperture 3.0.3 in order to access my aperture library as the older version of Aperture is not compatible with Snow Leopard.
At this point the free space available on my internal hard drive was 36GB and my aperture library was 39GB. I had to uninstall Photoshop Elements 9 in order to create enough free space to open this library.
I bought an external hard drive and after some organising (importing and exporting to and from external hard drive), I eventually moved all photo files/folders, projects and libraries onto this external drive, leaving only one in-progress project (about 3GB) left on the internal volume.
I also exported my iTunes library and any other files to this external drive.
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The problem is that, despite all this clear-out, I now only have 2GB of free space on the internal hard drive.
I ran Disk Inventory X and it shows that my home folder is using 155GB of space, which seems ridiculous considering there is in effect nothing left on my laptop save for the application programs and the one remaining project.
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I have repaired an issue with the internal volume, but it is now showing a “minor” problem with the volume header.
If someone can provide and explanation/solution to this I would be very grateful as it is severely slowing my workflow at the moment.
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Baresi:
I suggest that you begin with Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel, and report if it says anything but Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
I recommend that you make sure that you make a bootable clone of your entire volume using a utility like SuperDuper or Carbon Copy Cloner.
You should also seriously consider installing a larger capacity drive.
cornelius

Can't save file on iOS device with low free space available

Hi,
I was using SharedObject to save settings in my game. However, recently I discovered on one of our devices it doesn't work. I've found somewhere on this forum discussion that air can't save sharedobject when available space is lower than about 300mb (link here: Bug#3711301 - sharedobjects fail when available storage is low). On my iphone it's about 40mb, but file, which I want to save is just 2 variables.. persistenceManager doesn't work too (well i've looked at source and it's just using SharedObject). So i've decided to just write file by myself:
declarations:
public var mute:Boolean = false;
public static var fullId:String = "";
then in constructor:
flash.net.registerClassAlias("Settings", GameSettings);
load();
and finally save() and load() functions:
public function save():void
try {
log("begin save()");
var file:File = File.applicationStorageDirectory.resolvePath("settings.txt");
var stream:FileStream = new FileStream();
stream.open(file, FileMode.WRITE);
var settings:GameSettings = new GameSettings();
settings.fullId = fullId;
settings.mute = mute;
stream.writeObject(settings);
stream.close();
log("end save()");
catch (error:Error) {
log("[ERROR] " + error.name + ": " + error.message + "\n" + error.getStackTrace());
public function load():void
try {
log("begin load()");
var file:File = File.applicationStorageDirectory.resolvePath("settings.txt");
if(!file.exists){
log("settings.txt does not exist, created new one..");
save();
return;
var stream:FileStream = new FileStream();
stream.open(file, FileMode.READ);
var settings:GameSettings = stream.readObject() as GameSettings;
mute = settings.mute;
fullId = settings.fullId;
log("loaded mute = " + mute);
log("loaded fullId = " + fullId);
stream.close();
log("end load()");
catch (error:Error) {
log("[ERROR] " + error.name + ": " + error.message + "\n" + error.getStackTrace());
My GameSettings class:
package
public class GameSettings
public var fullId:String;
public var mute:Boolean;
public function GameSettings()
This works on desktop, android. Works on my ipad too, which has 10gb of free space. However, like I said, it doesn't work on iphone5s with 40mb free memory.
Here's a log:
begin load()
settings.txt does not exist, created new one..
[ERROR] Error: Error #0
     at Autumn/save()
     at Autumn/load()
     at Autumn()
It's clear that AIR can't open or write to 'settings.txt' file. What can I do to solve that issue (other than making more free space on iphone)? Is there any workaround for that?

Any help please?

Is ther a way to speed up a Mac? Mine has gotten slower and slower over time. When memory comes close to full would that have an effect on performance? Is there a way to determine unused programs/software to remove and free space?

Is there a way to speed up a Mac (similar to de-fragging on a PC)? Mine has gotten slower and slower over time.
When memory/disc comes close to full would that have an effect on performance? How should I determine what programs/software to remove and free space?

Things You Can Do To Resolve Slow Downs
If your computer seems to be running slower here are some things you can do:
Start with visits to:     OS X Maintenance - MacAttorney;
                                  The X Lab: The X-FAQs;
                                  The Safe Mac » Mac Performance Guide;
                                  The Safe Mac » The myth of the dirty Mac;
                                  Mac maintenance Quick Assist.
Boot into Safe Mode then repair your hard drive and permissions:
Repair the Hard Drive and Permissions Pre-Lion
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
Repair the Hard Drive - Lion/Mountain Lion/Mavericks
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilites Menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD disk icon and click on the arrow button below.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
Restart your computer normally and see if this has helped any. Next do some maintenance:
For situations Disk Utility cannot handle the best third-party utility is Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible.
Note: Alsoft ships DW on a bootable DVD that will startup Macs running Snow Leopard or earlier. It cannot start Macs that came with Lion or later pre-installed, however, DW will work on those models.
Suggestions for OS X Maintenance
OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep. Dependence upon third-party utilities to run the periodic maintenance scripts was significantly reduced since Tiger. These utilities have limited or no functionality with Snow Leopard or later and should not be installed.
OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive.
Helpful Links Regarding Malware Protection
An excellent link to read is Tom Reed's Mac Malware Guide.
Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.
See these Apple articles:
          Mac OS X Snow Leopard and malware detection
          OS X Lion- Protect your Mac from malware
          OS X Mountain Lion- Protect your Mac from malware
          About file quarantine in OS X
If you require anti-virus protection I recommend using VirusBarrier Express 1.1.6 or Dr.Web Light both from the App Store. They're both free, and since they're from the App Store, they won't destabilize the system. (Thank you to Thomas Reed for these recommendations.)
Troubleshooting Applications
I recommend downloading a utility such as TinkerTool System, OnyX, Mavericks Cache Cleaner, or Cocktail that you can use for removing old log files and archives, clearing caches, etc. Corrupted cache, log, or temporary files can cause application or OS X crashes as well as kernel panics.
If you have Snow Leopard or Leopard, then for similar repairs install the freeware utility Applejack. If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the command line. Note that AppleJack 1.5 is required for Leopard. AppleJack 1.6 is compatible with Snow Leopard. Applejack does not work with Lion and later.
Basic Backup
For some people Time Machine will be more than adequate. Time Machine is part of OS X. There are two components:
1. A Time Machine preferences panel as part of System Preferences;
2. A Time Machine application located in the Applications folder. It is
    used to manage backups and to restore backups. Time Machine
    requires a backup drive that is at least twice the capacity of the
    drive being backed up.
Alternatively, get an external drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
1. Carbon Copy Cloner
2. Get Backup
3. Deja Vu
4. SuperDuper!
5. Synk Pro
6. Tri-Backup
Visit The XLab FAQs and read the FAQ on backup and restore. Also read How to Back Up and Restore Your Files. For help with using Time Machine visit Pondini's Time Machine FAQ for help with all things Time Machine.
Referenced software can be found at MacUpdate.
Additional Hints
Be sure you have an adequate amount of RAM installed for the number of applications you run concurrently. Be sure you leave a minimum of 10% of the hard drive's capacity as free space.
Add more RAM. If your computer has less than 2 GBs of RAM and you are using OS X Leopard or later, then you can do with more RAM. Snow Leopard and Lion work much better with 4 GBs of RAM than their system minimums. The more concurrent applications you tend to use the more RAM you should have.
Always maintain at least 15 GBs or 10% of your hard drive's capacity as free space, whichever is greater. OS X is frequently accessing your hard drive, so providing adequate free space will keep things from slowing down.
Check for applications that may be hogging the CPU:
Pre-Mavericks
Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
Mavericks and later
Open Activity Monitor in the Utilities folder. Select All Processes from the View menu. Click on the CPU tab in the toolbar. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
Often this problem occurs because of a corrupted cache or preferences file or an attempt to write to a corrupted log file.

166Gb of free space not showing in Finder

Hi, my Mac started saying I need to free up space on my Startup Disk. I was suprised, but as I've been doing some film work, I just thought it must take up even more space than I thought. Anway, I free'd up loads of spaced, I moved all my film files to an external disk, deleted them from where they were, and emptied the trash. I've got rid of other things like Internet cache and downloads, basically, I know i have space now. However, my Mac insists on saying I only have about 2Gb free. On another site, someone recommended something called Disk Inventory X, which gives a visual picture of what files etc are taking up space on the Mac. I ran this, and low and behold I have 166Gb free. The screen shot below shows the big blue square of free space. If you can zoom in, it shows this as something outside of the home 'Tiger' thing, under Users - .tiger, as though its partitioned or something?! I don't really understand how Mac's work under the hood of pretty buttons etc, so I'm a bit stuck now.
Can anyone please tell me why my Mac can't see or let me use all this free space?
I am running Snow Leopard 10.6.8. It is a 13" mid 2009 MacBook Pro 5.5, 2.26 GHz Intel Core 2 Duo with 4Gb 1067 MHz DDR3 if that's of any help.
Many thanks in advance.

With regard to corruption at the HD level, it is unlikely but possible - I would run Disk Utility's "Verify Disk" if you haven't already done so.
'It' is the Home folder in Finder
Yes, as I mentioned in my earlier post, it is "normal" (and not meaningful) for a FileVault Home to show an apparent capacity that is twice the capacity of the HD itself. The "Used" space reported there is likewise meaningless - that's why I earlier suggested a different method for determining the total size of your user files. However the reported "available" space is apparently accurate, and at least in my test setup is the same number that you will see for "available" if you Get Info on Macintosh HD.
I have 177Gb of User stuff, this also includes my Applications
So as not to compare apples and oranges, "user stuff" generally refers only to those items within the home folder. Some people have a second Applications folder within the home folder, but if you are instead referring to applications in the standard Applications folder (HD>Applications) then that space is generally not counted as "user files." It makes a difference when you are trying to see if the numbers "add up", as is the case here. In your first screenshot, Disk Inventory X reported 94.5GB in HD>Library, 23.3GB in HD>Applications. and about 13GB in other places, for a total of 131GB, which after the 7% correction to decimal GB, is about 140GB. If you have 177GB of stuff within your home folder using the method I suggested earlier, then that would completely fill your 320GB HD. If you had counted the entire main Applications folder as part of your "user stuff" then you would be expected to have about 25GB free - still not a lot on a 320GB HD.
With regard to just wiping the HD and re-installing the OS, yes you can then drag back your user data, but apps can be problematic. Apps that were originally installed by dragging them directly from a downloaded .dmg or apps that were bought in the App store can usually just be copied back into /Applications, but apps that were originally installed via an installer package often have support files that were installed in other places as well, and such apps usually have to be re-installed from scratch. The Libraries generally contain important information as well (Mail, Keychains, and Bookmarks as well as application support files and preference files). You would also have to re-do network settings, etc.
I asked whether you had a large (>750GB) empty partition of external storage still available, because I think that would be your best bet for recovering everything intact. If you have such a large external partition formatted for the Mac, I would try the following:
Create a new admin account, log out of the FileVault account, and log into the new account. From there, run Carbon Copy Cloner to clone Macintosh HD onto the large external drive. Reboot from that external drive, and log into the FileVault account there. Now everything should be as before, except for one important difference - you should now have enough free space to turn off FileVault! If this works you could eventually clone back to the internal HD, presumably after pruning back some of your stuff if necessary.
FileVault, as you have seen, can cause lots of issues. I have never used it except for testing and tinkering. It was completely re-done for Lion, and Lion's FileVault is reportedly is a big improvement, but I haven't used it there myself.

Wrong amount of free space

I searched the forum, and it seems that other people have a problem with the OS seemingly reporting too little free space on the disk, which is the opposite of the problem I have.
I'm being shown that I have MUCH more free space than I do. I have a (Early 2013) MacBook Pro 15" with Retina display and a 500 GB SSD. Using "Get Info," the hard drive reports that I have a capacity of 499.42 GB with 459.04 GB free and only ~40 GB used. The "Item Info" below the disk name reports the same thing. This is impossible, considering the amount of data that I have stored, including a 60 GB Windows 7 partition. Disk Utility reports the correct amount of disk space available as does About This Mac.
Any idea what's causing the discrepancy? Since Disk Utility is reading the drive correctly and reports no problems when I use "Verify Disk," I'm guessing it's not a big deal, but I'd like to know if there's a fix.
Thanks.

Try re-indexing Spotlight:
http://support.apple.com/kb/ht2409

Scheduling SecureErase of Free Space

I would like to schedule an automatic (daily) run of Disk Utility's Secure Erase Free Space. How do I do this?
I did find this command:
sudo diskutil secureErase freespace 1 <diskname>
Thanks.

Hi, HGG. Welcome to the Discussions.
A word of caution concerning Secure Erase Free Disk Space. I would not use that function without first:
1. Assuring the disk in question was free of directory corruption via Disk Utility > Verify Disk. If the directory is corrupted, space considered "free" could actually be occupied by files.
2. Having a full backup of the disk in question. This is a worthwhile prophylactic step that should be relatively straightforward if you've implemented a comprehensive Backup and Recovery solution. For advice on my backup and recovery solution, see my "Backup and Recovery" FAQ.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Erase free space function of Disk Utility

Hi all,
I've read some of the discussions about the problems that can result from using Disk Utility to permanently delete items that have been emptied from the Trash (and which were not "securely" emptied). Before I use the Disk Utility function, I'd appreciate some advice:
1. I have an iBook G4, running Mac OS 10.4.11. My hard disk has a capacity of 55 GB with 30 GB available. Does the capacity available matter, and is mine sufficient?
2. Will I be given an option on overwriting the files 0, 7, or 35 times, and should I choose 7?
3. How long is this operation likely to take?
4. Shall I just start the operation and then not touch the computer for a few hours, or overnight, and hope for the best??
5. A final question (a stupid one, I hope!) -- only those files which were put in the trash will be deleted, right?? Not anything else?!
I am quite worried about taking the step because, if things go wrong, I won't have a means of contacting the Apple support forum as this is the only computer in our household.
I am planning on giving this iBook to a nephew in six months or so, and am gradually cleaning it up for that purpose. But I'm not ready to "zero it out" entirely and I am hoping not to lose anything currently on my hard drive following the "erase free space" operation, or to have to reboot from the original CDs.
If the operation is successful, I will then remember to always use the "Secure Empty Trash" option when deleting future files. I'm assuming that, if I do that, I should have no concerns about giving the laptop away -- correct?
As you can tell, I'm not very computer savvy, and I'd be very grateful for help. Thank you!

Open Disk Utility, Highlight your drive on the left, then on the right bottom you'll see Verify Disk & below that Repair Disk grayed out because you can't reopair the HD yo're booted from, if it does need Repair...
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes

Verifying Free space in Flash

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