Hard Disk verification.

recently i ran a verification (occasional system checkup) and my main hard drive could not be verified. so i used the osx install disk to repair my mac os system disk. and it worked! however i noticed that im having to do this more often. and every time im having to repair form osx install disk. the disk is repairing ok. over all i never had any problems in performance, or anything its just my disk wont verify, im worried that something will go wrong. its just i never had to do this before, but now it came up once twice and more frequently + randomly. so is my disk failing (slowly) ?
side notes:
all 4 bays are occupied, no verification problems in other drives.
i have windows 7 form few games i play - shouldnt affect osx
im just worried, its coming up more and more.
would apple replace drive under warranty?
please let me know, thank you

iJny9956 wrote:
i have tech tool pro edrive, should i do a volume rebuild?
Not without a backup first!
Do you have a hard drive for backup with Time Machine activated? If not, STOP!
Get an external hard drive that is at least 20% larger than your boot drive, or even better 20% larger than all of your active hard drives on your system (excluding any Windows Boot camp partitions) and activate Time Machine and let it back up your system.
Do that FIRST!
Once you have a backup, then you can start experimenting with tech tool pro. The volume rebuild rebuilds the directory on your hard drive. The directory is a low level part of the file system on your hard drive. Think of it as a table of contents and index - it lets the computer know where to find your files on the hard drive. It's a potentially risky operation, and if there is a physical problem with your hard drive (which it is beginning to sound like there might be) and a problem writing out the directory back to your hard drive fails and you loose the volume, you will at least have a backup.
Some will insist you need to make a backup with a program like SuperDuper! That's fine if you want to, but there is nothing wrong with TimeMachine. The reason I encourage TimeMachine over SuperDuper or other cloning as a backup is TimeMachine is automatic and built into the OS. You are much more likely to backup your machine if it's easy to do, and there is no backup procedure easier than TimeMachine. And you can restore from a TimeMachine backup, you just can't boot from it. But you do have your Snow Leopard DVD which you can boot from, and you can restore from TimeMachine as you re-install the OS once booted from your install DVD.
Back up your data first, then you can start troubleshooting your hard drive.
You might want to download this utility that will show you the SMART status of your hard drive:
http://www.apple.com/downloads/macosx/systemdiskutilities/smartutility.html
unlike Disk Utility, this program will show you all the stats of your SMART diagnostics, not just a summary like the Disk Utility. I just tested it out on my MacBook Pro and discovered my hard drive is failing (!!) so off to the Apple store I will go tomorrow to get it replaced! I had heard a few "clunks" from the hard drive and just assumed it was from the sudden motion sensor - apparently not. I'll be buying a family license of that utility and also installing it on my Mac Pro and PowerBook!
BTW - it is perfectly normal to have SMART errors and bad spots on a hard drive and programs like Tech Tool or Disk Utility not report any issues - that's because SMART works at a lower level within the hard drive. Hard drives are designed to self-correct a certain amount of errors, and it's designed to be transparent to the operating system or higher level programs. A few errors are OK, it's when you start seeing an excessive amount of errors (as I am on my MacBookPro hard drive!) that you should start to be concerned.

Similar Messages

Hard Disk verifies OK but wont boot. Can't re-install or erase.

I have a problem with my Powerbook (Tibook) G4 667.
It won’t boot. After the initial grey screen, it gets as far as a completely blue screen and eventually resorts to the Darwin console (?).
I'm running OS X 10.4.? (sorry - can’t remember when I last updated this machine). The 40 Gb internal drive is partitioned: HDA (start-up disk) 35 GB; HDB 2.5 Gb; HDC 2.5Gb.
This is the ‘family’ computer and is shared by five users for internet and general use.
I don’t use this machine often as I also have a 17” G4 1.5 (Alubook) running 10.4.7.
When I was told that it was behaving oddly I managed to save the ‘Users’ folder onto an external FW drive.
I can access the drive from my Alubook connected to the sick Tibook in FW target mode, although the Tibook HDA (the start-up partition) takes ages to show up on the Alubook desktop.
I have run Disk Utility from both the Tiger installation DVD and via FW from the Alubook and each time all partitions verify OK. I’ve run repair as well and this also gives an OK verdict.
As I now have copies of the data on the drive I have tried reinstalling the system from the Tiger DVD but the drive does not appear as a destination for installation (it doesn’t appaear at all, just the DVD and Network options are visible). I have tried to erase the drive but I get an ‘I/O error’ message when attempting to erase from the DVD disk utility and a ‘Can’t unmount disk’ error when attempting via FW from the Alubook.
I’ve tried everything along the lines of ‘fsck’ etc. as advised by Apple at the link below
http://docs.info.apple.com/article.html?artnum=106214
Everything checks out ‘OK’ though I did get a line mentioning I/O error on one ‘fsck’ cycle but it still reported everything as being OK.
It may well be that the drive is dead, but all the tests keep telling me it is alive.
Does anyone have any ideas?
Thanks very much.
Phil

Hi Phil,
Welcome to Apple Discussions.
It sounds like while booted from the Tiger install disc, DU can see the HD to run Repair Disk (which returns an "ok" message), but the installer cannot see the HD to do an installation? As arnie has said, it could be the HD, but could also be other hardware such as the logic board, RAM, or a cable.
Any chance the external FW HD you mention is a 2.5"/portable? If so, I would install it in the PB, boot from the Tiger install disc, and see if the installer will recognize it as an installation destination (make sure you don't go beyond that step or you will be installing the OS over the data you have saved on the HD). If it is recognized, looks like time to purchase a new HD. If not, time to start looking at other components.

MBA hard disk problems

I appear to be having hard disk problems and would appreciate any suggestions as to how to determine what the cause might be.
It began when the MBA late 2008 with 10.6.6 would not startup, just an endless cog wheel. Using the installation disk I found that the disk repair utility identified that the MBA hard disk was corrupted and the repair utility couldn't repair it.
I deleted the contents of the MBA disk verified the disk and reinstalled the system software and all my other programmes and files.
(This took about a day as I did not have a backup of the MBA but I did have the files and programmes on other disks etc. (Never again - I bought an external hard disk so that I could have a copy of the installation disc on it and also a backup of the MBA and all the system software updates.)
All has been well for a couple of weeks until today when the MBA would not start. For the first time in my life I saw a message covering most of the screen saying "Will not start up - turn the computer off by holding down the power button until it turns off and then restart the computer" or something similar.
Needless to say the computer refused to restart and again after looking at the MBA disk with the disk utility it required repair and again the repair utility said it could not complete the repair.
Wiped the MBA disk again and reinstalled and restored the programmes and files. (so much easier with the install image and backup on an external hard disk and Time Machine is tremendous).
So the MBA appears to be back to normal.
But will it stop again? It the hard disk flawed or fundamentally corrupted?
I have verified the hard disk with the apple disk utility and also with onyx. Both say it appears to be ok.
Any suggestions as to how to work out what if anything is going wrong would be much appreciated.

When I said verified I meant that I ran the verify and repair command in the apple disk utility and also ran both the smart status in onyx and additionally the verification command in onyx.
Just to clarify the second occasion that the MBA would not startup falls under the category of “You need to restart your computer” which indicates a indicates a “kernel panic”.

Disk utility unable to repare hard disk, need help !!

I have Dual 2.7 Ghz PowerPC G5
I have 2 hard disks one of which is used for the system (10.4.6). recently I run a disk utility verification on Macintosh HD (primary for MAC system disk).It found some errors ,but when I tried to repaire them I got this:
Error: The underlying task reported failure on exit
I tried to safe boot, but the computer just won't start. It starts for a few minutes ( I suppose it checking the system) and then restart again ( and if you hold the magic button fro safe boot it will restart and restart and restart).
I tried to write some unix command ( I can remember which ones- but there are for the sort of deep repairing, but they do nothing at all.
Please some one help me to repare my disk ( may be suggest some third party program or something else.)
Thanks in advanced.

Journaling is explained here
http://docs.info.apple.com/article.html?artnum=107249
It aids system recovery but the operation is automatic and not visible to the user.
Have you have checked the files suggested in The hatter's link?
Sorry, losing the thread a bit between all these different posts and problems. I can only suggest going back to basics:
Back-up your data if possible - if you haven't already.
Reset the PMU
Disconnect all non-essential peripherals leaving just display, keyboard and mouse; unplug from the mains and leave for at least 30 mins; re-connect mains plug to G5(to earth the casing), then reset the PMU
http://macosg.com/group/viewtopic.php?t=5819&highlight=resetting+pmu
Note static precautions and the warning to press the button once only.
Then boot from the system DVD and run the Apple Hardware Test.
Then, while booted from the system DVD, run Disk Utility on your internal boot drive and try to repair it. Some further notes here
http://docs.info.apple.com/article.html?artnum=302672
If it still finds unrepairable errors you will probably have to Erase & Install
http://docs.info.apple.com/article.html?artnum=301270
Then use the combo updater
http://www.apple.com/support/downloads/macosx1046comboforppc.html
Re-install applications and restore user data.
Apologies if this is overkill - or if there are any omissions - have to go to bed now - no, have breakfast - no, wait a minute, what day is it? - what's the Prime Minister's name...?
Anyway, Good Luck. Let us know how you get on.

Slow start up and disk verification message

I have updated to 10.6.5.....
After update i'm facing slow start up....
after disk verification I found the following message.
Even after repairing i'm getting same messages..
Please help me to solve it..
Verify permissions for “Macintosh HD”
Permissions differ on "System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jconsole.ja r", should be lrwxr-xr-x , they are lrw-r--r-- .
User differs on "System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib", should be 0, user is 95.
User differs on "System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Libraries", should be 0, user is 95.
Permissions differ on "System/Library/Java/Support/Deploy.bundle/Contents/Resources/JavaPluginCocoa.b undle/Contents/Resources/Java/deploy.jar", should be lrwxr-xr-x , they are lrw-r--r-- .
Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Classes/jconsole.jar ", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/ Contents/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/deploy.jar", should be lrwxr-xr-x , they are lrw-r--r-- .

What you reported from Disk Utility is from repairing permissions, not verifying the hard drive. Nevertheless, those messages are innocuous, will be repeated whenever you repair permissions, and are unrelated to your problem.
The initial startup after updating will be slow. However, thereafter they should return to normal unless you have issues in your system installation such as not repairing the drive and or permissions before you updated.
So, do this now:
Repairing the Hard Drive and Permissions
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 Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Then download AppleJack - CNet Downloads or MacUpdate - and read the documentation carefully. Install the software and follow the instructions on how to use it.

Mountain Lion has broke the hard disk

I have a Macbook Pro 13' (Mid 2010) with LION which has always worked very properly.
-Wednesday 25th
On Wednesday 25th I've bought (16€) and instald Mac OS X Mountain Lion. The laptop seems too slow for me but I didn't mind at that moment, before going to sleep I shutted down the macbook pro.
-Thursday 26th
The next day, when I tried to turn on, it stayed at the white screen with the apple and thinking. I tried it for several times, and at one of them after 10 minutes the os started but it worked incredibly slow (It was imposible to shut down it normaly). I called to apple care, they told me to enter in recovery mode and verify the disk. I do it and all was ok. I restarted and as before the mac didn't started or at least started and worked very slow.
-Friday 27th
I tried to turn on the laptop with the recovery mode, but I had no response of the macbook pro,it stayed with the white screen. I called again to apple care and after some times I could enter to the recovery mode, but this time the were important errors at verifing the disk and it was impossible to fix it.
So I went to apple premium reseller near to my home. They found all the hardware ok with their test but they told me to open the laptop and change the hard disk (paying 200€) to solve the problem. I sayed thank you very much and I took a quote at the Genius Bar in the Apple Store for the afternoon. They found all the hardware ok again but they weren't able to fix the problem by this moment. So they told my to leave the computer and they would reinstall mountain lion from 0, without any cost.
After 3 hours I've recevied a call from the Apple Store telling my that the hard disk was broken and I've to pay for a new one (150€).
They are not taking into account that the laptop was ok and by installing the new OS and making all the test and restarts that they told me to do are the cause of hard disk's rupture.
What can I do? What do you recomend to me?
Thank you very much.
P.S. : I've always loved my Macbook Pro and I haven't had any problem with it or with Apple, all have worked perfect until this moment and know I feel helpless.

I have a Macbook Pro 13' (Mid 2010) with LION which has always worked very properly.
-Wednesday 25th
On Wednesday 25th I've bought (16€) and instald Mac OS X Mountain Lion. The laptop seems too slow for me but I didn't mind at that moment, before going to sleep I shutted down the macbook pro.
-Thursday 26th
The next day, when I tried to turn on, it stayed at the white screen with the apple and thinking. I tried it for several times, and at one of them after 10 minutes the os started but it worked incredibly slow (It was imposible to shut down it normaly). I called to apple care, they told me to enter in recovery mode and verify the disk. I do it and all was ok. I restarted and as before the mac didn't started or at least started and worked very slow.
-Friday 27th
I tried to turn on the laptop with the recovery mode, but I had no response of the macbook pro,it stayed with the white screen. I called again to apple care and after some times I could enter to the recovery mode, but this time the were important errors at verifing the disk and it was impossible to fix it.
So I went to apple premium reseller near to my home. They found all the hardware ok with their test but they told me to open the laptop and change the hard disk (paying 200€) to solve the problem. I sayed thank you very much and I took a quote at the Genius Bar in the Apple Store for the afternoon. They found all the hardware ok again but they weren't able to fix the problem by this moment. So they told my to leave the computer and they would reinstall mountain lion from 0, without any cost.
After 3 hours I've recevied a call from the Apple Store telling my that the hard disk was broken and I've to pay for a new one (150€).
They are not taking into account that the laptop was ok and by installing the new OS and making all the test and restarts that they told me to do are the cause of hard disk's rupture.
What can I do? What do you recomend to me?
Thank you very much.
P.S. : I've always loved my Macbook Pro and I haven't had any problem with it or with Apple, all have worked perfect until this moment and know I feel helpless.

Could my Macbook magnet have wiped a hard-disk?

I have an external 250Gb Freecom toughdrive, on which I had about 80Gb of valuable data. I took my laptop and hard drive into my living room and when I went to access the drive *it was completely empty*, just a single file with the a garbled filename. I tried the disk utility application (repair disk), which hasn't done anything and the disk verifies, so I'm wondering what's happened to all my data! *I didn't drop the drive(!)* and I've got my laptop plugged into the power supply and the drive plugged directly in (no hub etc).
I'm wondering if it's the magnet in the laptop because the toughdrive has a very short built-in USB cable (about 3 inches), so I had it perched on top of the left-hand USB slot (also where the powersupply is situated).
Anyone out there have a similar experience? The drive is readable, but empty. I've also had a look on my wife's Pc laptop, which shows the same problem!

There is no way that the magnet in the laptop magsafe connector could erase a hard drive. Maybe the one at the scrap yard that can pick up a car could erase a hard drive but not the miniscule magnet in the MBP.

Restore a external hard disk

Hello,
Can I restore old rman backup on external hard disk with USB3? the size of database is 430 GB.
Thank you.

damorgan wrote:
I have never tried but I would hope the answer is no.I have done it, and the answer is sadly 'Yes' ;-)
RMAN doesn't have any opinions on where you restore your backups, as long as the disk area is addressable in your system (i.e. mounted with a path/letter, depending on your OS).
But on the other hand, I wouldn't do this on a production system, only for backup/recovery verification/development system creation.
//Johan

M6-1105dx cannot detect hard disk

my machine is m6-1105dx with window 7. It cannot boot up with an error "boot device not found, please install an operating system on your hard disk." The error number is 3F0, and it reminds pressing F2 for system diagnostics.
In the diagnostic, memory test works fine, but hard disk check gives error "SMART Check: NOT INSTALLED; short DST: NOT INSTALLED".
I tried with two different hard disks and it gave same errors. Anyone knows what is going on?
This question was solved.
View Solution.

Assuming the hard disks are actually showing good on another PC, then the SATA cable may be bad, the power connections may have failed, or the contoller is bad. I would start with verifing that those first several items - hard drive, SATA cable, power connections, ETC are good. If it is the controller, it is not easy to repair on a laptop. Probably need a new motherboard. I used something similar to THIS to verify the drive is good or not.
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Disk verification stopped by user

My aunt has a G5 iMac with OS 10.4.11. A year ago, her password mysteriously changed, and when she tried to verify the disk using DU, before the verification finished it would say "stopped by user."
We reset the password with Single User Mode, and she could again verify her disk.
Now, suddenly she can't connect with the internet. Her DSL modem says it has sync and has Ethernet communication with the computer, but if she clicks Network in Profiler, it doesn't list Ethernet or Firewire or anything else.
If the modem says it has Ethernet communication, I suppose the iMac's Ethernet hardware works. What problem could interrupt disk verification and make the OS unaware of Ethernet and Firewire?

Two thing to try:PRAM reset and an SMU reset.
Also, using Disk Utility to check the disk:
1. Start from your Mac OS X Install disc: Insert the installation 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. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.

Resize the CentOS LVM inside VM from a secondary virtual hard disk

Requirement:
Airwave installed on a VM, with a secondary virtual hard disk.
we have a KB "Resizing the centOS LVM inside VM", is only useful if we have one hard disk for that VM instance.
https://arubanetworkskb.secure.force.com/pkb/articles/FAQ/Resizing-CentOS-LVM-inside-VM
However, This KB will be helpful in the scenario's where VM Administrators has to create a secondary virtual Hard disk, instead of increasing the disk space for current hard disk (could be for any reason for example: he cannot increase the disk space for the same disk as the pool that provides space to that disk has no space etc..).
Solution:
In this case, when we have added a secondary virtual hard disk, when we do # fdisk -l, we will see the secondary disk as /dev/sdb as shown below:
[root@localhost mercury]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000650f3
   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      102400   83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              13        5222    41839616   8e Linux LVM
Disk /dev/sdb: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup00-LogVol01: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup00-LogVol00: 38.5 GB, 38520487936 bytes
255 heads, 63 sectors/track, 4683 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
And this is the # df -h, command output, before the LVM extension:
[root@localhost mercury]# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       36G   11G   23G 32% /
tmpfs                 3.7G     0 3.7G   0% /dev/shm
/dev/sda1              97M   37M   56M 40% /boot
We need to extend the sdb disk space to VG group to combine to use the disk space as shown below in the configuration:
Configuration:
1. First, we need to create a partition in /dev/sdb
[root@localhost mercury]# fdisk /dev/sdb
# n {new partition}
# p {primary partition}
# 1 {select partition number, by default 3 is the next available}
# use the default cylinder values for First and last
# t {select partition id we just made (1)}
# 8e {Linux LVM partition}
# p {print. the new device should be described as Linux LVM}
# w {write to memory}
2. We need pv reate /dev/sdb1:
[root@localhost mercury]# pvcreate /dev/sdb1
3. Execute the command to extend the VG to sdb1:
[root@localhost mercury]# vgextend VolGroup00 /dev/sdb1
4. Enter the command to extend the LV to sdb1:
[root@localhost mercury]# lvextend /dev/VolGroup00/LogVol00 /dev/sdb1
5. Resize the VG:
[root@localhost mercury]# resize2fs /dev/VolGroup00/LogVol00
Done.
Verification
Now look at the # df -h, output, which will be different:
[root@localhost mercury]# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       52G   11G   38G 22% /
tmpfs                 3.7G     0 3.7G   0% /dev/shm
/dev/sda1              97M   37M   56M 40% /boot

Hi Eric,
"My first thought was to do is reduce the drive, which I know cannot be done. I then thought to convert the disk but it consumes the whole of the dynamic potential, which somehow is a maximum of 2TB."
Yes , we can not get the disk space less than 2TB .
As a workaround , you can try the following steps :
1) defrag the volume  in VM , after that shutdown the VM
2) use "edit disk" in hyper-v manager to compact the VHD file
3) start that VM then shrink the volume that the disk space is larger than the VM needs in disk manager
This may limits the expansion accordingly .
Hope it helps
Best Regards
Elton JI
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External Hard disks corrupted

Hello,
2 external hard disks and a USB of mine has been corrupted out of sudden over a time span of 2 months, the hard disks I only connect them to my Macbook Air, the USB I connect to many computers.
I took my mac to the apple care they have ran all tests and it passed them all. I was wondering if my mac is the one causing my external disks to get corrupted out of sudden.
Please help as I am losing lots of data, and I cant keep changing external hard disks and USBs....
Help..

The external hard disks mostly gets corrupted incase of a power outage or power failure when the external hard disk and mac are transferring some files.
In that case only the cache files are transferred and not the data files which may corrupt the files.
HDD corruption can also be caused due to some already corrupted files sitting and corrupting the other files.
It can also be caused due to Viruses or Malwares. But here the chances are very rare as there are very very few viruses ever created for Mac OS.
It can also be caused due to physical shock damage by damaging the main platters in the hard disk.
Try to repair the Hard disk by running Disk utility. Applications > Utilities folder > Disk Utility. Then select your external drive on the left hand column and select the Verify disk option and later after the verification select the repair disk option and try to repair it. If that doesn’t help then you will need to buy Disk Warrior.
Disk Warrior is an excellent Disk Directory repair tool......http://www.alsoft.com/DiskWarrior/
Never doubt Disk Warriors potentials as it has helped many users.
Hope this helps.....

Hard disk test? and when to tighten?

hard disk test? and when to tighten?

I'm not quite sure what you mean either, but if you are worried about the state of the hard drive then this is probably the information you need...
Check your iPod with Diagnostics Mode
It's possible that your iPod's hard drive has started to fail. Take your iPod and place your right thumb on the centre SELECT button and your left on the top MENU button. Press down both thumbs for about 6 seconds until your iPod reboots. Immediately move your left thumb around to the rewind button |<< on the left and hold this down together with SELECT for a further 6 seconds. Your iPod should now switch into Diagnostic Boot mode. Press MENU for Manual Test, then select IO > HardDrive > HDSMARTData to reveal your stats. For comparison here are mine taken when my 6th Generation Classic was about 2 years old:
Retracts: 889
Reallocs: 12
Pending Sectors: 0
PowerOn Hours: 2202
Start/Stops: 894
Temp: Current 24c
Temp: Min 10c
Temp: Max 50c
Take a note of your results. When finished press SELECT & MENU for 6 seconds to reset the iPod again.
With modern disc drives sectors are no longer marked bad by a disc scan, if the SMART firmware detects a sector it has trouble accessing it will attempt to invisibly reallocate it to a spare area of the disc.
Note that I've only 12 remapped sectors and none pending. To help explain what the numbers mean here is an extract from the Wikipedia S.M.A.R.T. article:
Reallocated Sectors Count
Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks this sector as "reallocated" and transfers data to a special reserved area (spare area). This process is also known as remapping, and "reallocated" sectors are called remaps. This is why, on modern hard disks, "bad blocks" cannot be found while testing the surface – all bad blocks are hidden in reallocated sectors. However, as the number of reallocated sectors increases, the read/write speed tends to decrease. The raw value normally represents a count of the number of bad sectors that have been found and remapped. Thus, the higher the attribute value, the more sectors the drive has had to reallocate.
Pending sector count
Number of "unstable" sectors (waiting to be remapped, because of read errors). If an unstable sector is subsequently written or read successfully, this value is decreased and the sector is not remapped. Read errors on a sector will not remap the sector (since it might be readable later); instead, the drive firmware remembers that the sector needs to be remapped, and remaps it the next time it's written.
Large numbers of Reallocs or Pending Sectors would suggest your drive is failing and that you may need to repair or replace your iPod. Check your stats after another attempt to update your iPod. If the numbers increase that again points to hard drive failure. While it won't be good news at least you'll know it isn't some random software problem and you can decide what to do next.
tt2

I am using Windows 8.1 i have an External Hard Disk and one drive is now inaccessible due to sudden power failure few days ago. Now it shows "Data error (Cyclic redundancy check)". I want all my important files and Pics. How ?

Hi,
I am using Windows 8.1
I have an External Hard Disk i have partitioned it to 4 parts.
One drive is now inaccessible due to sudden power failure while listening Music from that drive few days ago.
Now it shows "Data error (Cyclic redundancy check)".
I tried all the procedures provided here like
chkdsk /f, diskpart, rescan etc
but no result :( (i mean all processes failed. They could not detect the drive).
Please help me to get those data, pictures and project files.
thank you

Then why aren't you posting this in the Windows 8 forums found @
http://social.technet.microsoft.com/Forums/windows/en-US/home?category=w8itpro
This is a Windows 7 forum for discussion about Windows 7.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

Delete file from hard disk etc.?

Can iTunes do the following, and how?
1. When I ask a file to be deleted from the Library, is there some way of asking for the file to be deleted from the hard disk itself?
2. If the location of the file has changed, can iTunes update its library and delete the unfound files from its list?

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
*http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

Hard Disk verification.

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