Unable to repair External Drive disk permissions

I have an external harddrive which holds my itunes library. Today I have been getting permission errors and now my itunes won't access the files on the drive.
I have tried to fix the errors with disk utility but now when I try to repair it I get the error: Could not unmount the disk.
Now I can't even see the iTunes folder on the external drive (I can see others) but I know it is there as 150GB of data is unaccounted for.

I had the same problem with my Time Machine backup disk and was able to solve it without the serious computer calisthenics recommended by others on the web. I'm running Snow Leopard on an intel iMac and using an external Seagate drive. Here's how I got it fixed.
1. Unmounted the drive and unplugged it.
2. Plugged it back in after a decent interval to let the disk spin down.
3. Shut down the iMac and restarted it a few minutes later (hard reset).
4. THE DISK DID NOT SHOW UP IN FINDER. Because I had a lot of work to do, I postponed further systems programming.
5. After about 20 minutes, my Norton utilities found it and began to search it. It was back in finder with r/w permissions for me and everybody else.
Hope this helps.

Similar Messages

Unable to repair degraded Virtual disks in Storage Spaces under Hyper-V 2012 R2 Core

Hi all,
I am finding myself in the following conundrum. I have a storage pool under Hyper-V Core, with 2 2TB Seagate drives.
One of the drives completely died (wouldn't spin up, tried it in a different box, still to no avail). I sent it in to Seagate for warranty replacement, got the new drive. Installed it and went through the notions of adding it to the pool and retiring the
one that was with "Lost Communication" status.
Tried to repair the virtual disks that are showing as "Unhealthy-Detached", quickly get 100% complete, but the repair didnt work.
The storage pool is in degraded state.
Looks like metadata is corrupted.
Followed this post to upgrade Storage Spaces to latest version:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/eead59e9-5e49-4bb6-8cbb-1dafddd9576b/unable-to-repair-degraded-virtual-disks-in-storage-spaces-2012r2?forum=winserverfiles
Still, to no avail.
Couple of questions:
1) Is the data on the 3 virtual disks in state "Unhealthy: Detached" not recoverable?
2) How can I get the storage pool back to "healthy"?
Any help will be greatly appreciated.
PS C:\corefig> Get-PhysicalDisk | ? OperationalStatus -ne OK | fl
ObjectId : {1}\\HV001\root/Microsoft/Windows/Storage/Pr
oviders_v2\SPACES_PhysicalDisk.ObjectId="{95
42513c-a0d4-11e3-8123-806e6f6e6963}:PD:{7e22
245f-0cf6-11e3-b1db-806e6f6e6963}"
PassThroughClass :
PassThroughIds :
PassThroughNamespace :
PassThroughServer :
UniqueId :
AllocatedSize : 1218696970240
BusType : Unknown
CannotPoolReason : In a Pool
CanPool : False
Description :
DeviceId :
EnclosureNumber :
FirmwareVersion :
FriendlyName : PhysicalDisk-1
HealthStatus : Warning
IsIndicationEnabled :
IsPartial : False
LogicalSectorSize : 0
Manufacturer :
MediaType : UnSpecified
Model :
OperationalStatus : Lost Communication
OtherCannotPoolReasonDescription :
PartNumber :
PhysicalLocation :
PhysicalSectorSize : 0
SerialNumber :
Size : 1999575711744
SlotNumber :
SoftwareVersion :
SpindleSpeed : 0
SupportedUsages : {Auto-Select, Manual-Select, Hot Spare,
Retired...}
Usage : Retired
PSComputerName :
PS C:\corefig> get-physicaldisk
FriendlyName CanPool OperationalS HealthStatus Usage Size
tatus
PhysicalDisk4 False OK Healthy Auto-Select 73.75 GB
PhysicalDisk0 False OK Healthy Auto-Select 1.82 TB
PhysicalDi... False Lost Comm... Warning Retired 1.82 TB
PhysicalDisk2 False OK Healthy Auto-Select 930.75 GB
PhysicalDisk3 False OK Healthy Auto-Select 74.53 GB
PhysicalDisk1 False OK Healthy Auto-Select 1.82 TB
PS C:\corefig> get-virtualdisk -friendlyname 'Data' |FC
class CimInstance#ROOT/Microsoft/Windows/Storage/MSFT_VirtualDisk
ObjectId = {1}\\HV001\root/Microsoft/Windows/Storage/Providers_v2\SPACES_Virt
ualDisk.ObjectId="{9542513c-a0d4-11e3-8123-806e6f6e6963}:VD:{3debf056-01f1-11
e3-b1d6-001fbc081884}{7e2229cf-0cf6-11e3-b1db-001fbc081884}"
PassThroughClass =
PassThroughIds =
PassThroughNamespace =
PassThroughServer =
UniqueId = CF29227EF60CE311B1DB001FBC081884
Access = Read/Write
AllocatedSize = 548413636608
DetachedReason = Incomplete
FootprintOnPool = 1096827273216
FriendlyName = Data
HealthStatus = Unhealthy
Interleave = 262144
IsDeduplicationEnabled = False
IsEnclosureAware = False
IsManualAttach = False
IsSnapshot = False
LogicalSectorSize = 512
Name =
NameFormat =
NumberOfAvailableCopies =
NumberOfColumns = 1
NumberOfDataCopies = 2
OperationalStatus = Detached
OtherOperationalStatusDescription =
OtherUsageDescription =
ParityLayout = Unknown
PhysicalDiskRedundancy = 1
PhysicalSectorSize = 4096
ProvisioningType = Thin
RequestNoSinglePointOfFailure = False
ResiliencySettingName = Mirror
Size = 1099511627776
UniqueIdFormat = Vendor Specific
UniqueIdFormatDescription =
Usage = Other
WriteCacheSize = 0
PSComputerName =
PS C:\corefig> get-virtualdisk -friendlyname 'Backups' |FC
class CimInstance#ROOT/Microsoft/Windows/Storage/MSFT_VirtualDisk
ObjectId = {1}\\HV001\root/Microsoft/Windows/Storage/Providers_v2\SPACES_Virt
ualDisk.ObjectId="{9542513c-a0d4-11e3-8123-806e6f6e6963}:VD:{3debf056-01f1-11
e3-b1d6-001fbc081884}{7e22255e-0cf6-11e3-b1db-001fbc081884}"
PassThroughClass =
PassThroughIds =
PassThroughNamespace =
PassThroughServer =
UniqueId = 5E25227EF60CE311B1DB001FBC081884
Access = Read/Write
AllocatedSize = 743566213120
DetachedReason = Incomplete
FootprintOnPool = 1487132426240
FriendlyName = Backups
HealthStatus = Unhealthy
Interleave = 262144
IsDeduplicationEnabled = False
IsEnclosureAware = False
IsManualAttach = False
IsSnapshot = False
LogicalSectorSize = 512
Name =
NameFormat =
NumberOfAvailableCopies =
NumberOfColumns = 1
NumberOfDataCopies = 2
OperationalStatus = Detached
OtherOperationalStatusDescription =
OtherUsageDescription =
ParityLayout = Unknown
PhysicalDiskRedundancy = 1
PhysicalSectorSize = 4096
ProvisioningType = Thin
RequestNoSinglePointOfFailure = False
ResiliencySettingName = Mirror
Size = 1649267441664
UniqueIdFormat = Vendor Specific
UniqueIdFormatDescription =
Usage = Other
WriteCacheSize = 0
PSComputerName =
PS C:\corefig> get-virtualdisk -friendlyname 'Music' |FC
class CimInstance#ROOT/Microsoft/Windows/Storage/MSFT_VirtualDisk
ObjectId = {1}\\HV001\root/Microsoft/Windows/Storage/Providers_v2\SPACES_Virt
ualDisk.ObjectId="{9542513c-a0d4-11e3-8123-806e6f6e6963}:VD:{3debf056-01f1-11
e3-b1d6-001fbc081884}{7e2238b9-0cf6-11e3-b1db-001fbc081884}"
PassThroughClass =
PassThroughIds =
PassThroughNamespace =
PassThroughServer =
UniqueId = B938227EF60CE311B1DB001FBC081884
Access = Read/Write
AllocatedSize = 39728447488
DetachedReason = By Policy
FootprintOnPool = 79456894976
FriendlyName = Music
HealthStatus = Unknown
Interleave = 262144
IsDeduplicationEnabled = False
IsEnclosureAware = False
IsManualAttach = True
IsSnapshot = False
LogicalSectorSize = 512
Name =
NameFormat =
NumberOfAvailableCopies =
NumberOfColumns = 1
NumberOfDataCopies = 2
OperationalStatus = Detached
OtherOperationalStatusDescription =
OtherUsageDescription =
ParityLayout = Unknown
PhysicalDiskRedundancy = 1
PhysicalSectorSize = 4096
ProvisioningType = Thin
RequestNoSinglePointOfFailure = False
ResiliencySettingName = Mirror
Size = 161061273600
UniqueIdFormat = Vendor Specific
UniqueIdFormatDescription =
Usage = Other
WriteCacheSize = 0
PSComputerName =
PS C:\corefig> get-virtualdisk -friendlyname 'Videos' |FC
class CimInstance#ROOT/Microsoft/Windows/Storage/MSFT_VirtualDisk
ObjectId = {1}\\HV001\root/Microsoft/Windows/Storage/Providers_v2\SPACES_Virt
ualDisk.ObjectId="{9542513c-a0d4-11e3-8123-806e6f6e6963}:VD:{3debf056-01f1-11
e3-b1d6-001fbc081884}{7e2225bc-0cf6-11e3-b1db-001fbc081884}"
PassThroughClass =
PassThroughIds =
PassThroughNamespace =
PassThroughServer =
UniqueId = BC25227EF60CE311B1DB001FBC081884
Access = Read/Write
AllocatedSize = 223606734848
DetachedReason = Incomplete
FootprintOnPool = 447213469696
FriendlyName = Videos
HealthStatus = Unhealthy
Interleave = 262144
IsDeduplicationEnabled = False
IsEnclosureAware = False
IsManualAttach = False
IsSnapshot = False
LogicalSectorSize = 512
Name =
NameFormat =
NumberOfAvailableCopies =
NumberOfColumns = 1
NumberOfDataCopies = 2
OperationalStatus = Detached
OtherOperationalStatusDescription =
OtherUsageDescription =
ParityLayout = Unknown
PhysicalDiskRedundancy = 1
PhysicalSectorSize = 4096
ProvisioningType = Thin
RequestNoSinglePointOfFailure = False
ResiliencySettingName = Mirror
Size = 1759325978624
UniqueIdFormat = Vendor Specific
UniqueIdFormatDescription =
Usage = Other
WriteCacheSize = 0
PSComputerName =

Hi omon_77,
You can first refer the following step by step third party article and KB:
Replace Failed Disks and Repair JBODs for Storage Spaces in Windows Server
https://technet.microsoft.com/en-us/library/dn782852.aspx?f=255&MSPPError=-2147217396
Replacing a failed disk in Windows Server 2012 Storage Spaces with PowerShell
https://www.hodgkins.net.au/storage/replace-failed-disk-in-storage-spaces-pool-with-powershell/
Step By Step: How to Replace Faulty Disk In Two-Way Mirrored Storage Tiered Space
http://charbelnemnom.com/2014/09/step-by-step-how-to-replace-faulty-disk-in-two-way-mirrored-storage-tiered-space-storagespaces-ws2012r2/
More information:
Storage Spaces - Designing for Performance
http://social.technet.microsoft.com/wiki/contents/articles/15200.storage-spaces-designing-for-performance.aspx
Storage Spaces Overview
http://technet.microsoft.com/en-us/library/hh831739.aspx
Windows Server Storage Spaces: What is it and why should I use it?
http://curah.microsoft.com/5049/windows-server-2012-r2-storage-spaces-what-is-it-and-why-should-i-use-it
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Disk Utility Unable to Repair External FireWire Hard Disk

Hello all.
This is the External FireWire Hard Disk that has been giving me problems for days, it is a Backup/Clone Disk of my sis's Mac mini Core Duo, and may explain why it was so hard and took so much pain to copy some of the data out, at times it failed to mount, and I manage to rescue some data after using Disk Warrior, but Disk Warrior was also unable to replace it with a new directory.
Anyway, so I (was able to) mount the hard disk, and I was successful in erase and reformating it.
But when I (try to) repair it with Disk Utility's First Aid, this report is what I get:
(The usual 'Checking...' text lines, text in BOLD indicates RED colour text)
Checking HFS Plus volume
Checking Extents Overflow file
Checking Catalog file
Checking Catalog hierarchy
Checking volume bitmap
Volume Bit Map needs minor repair
Checking volume information
The volume Untitled could not be repaired after 3 attempts
Error: The underlying task reported failure on exit
1 HFS volume checked
1 volume could not be repaired because of an error
Repair attempted on 1 volume
1 volume could not be repaired
Then a window dropped down from the top says:
First Aid failed
Disk Utility stopped repairing "Untitled" because the following error was encountered:
The underlying task reported failure on exit
(OK Button)
I guess this hard disk is really a gone case?? I am quite OK just to replace it with a brand new one... maybe all the trouble I had in the beginning is because I may already have a faulty backup drive to begin with???
Thanks and cheers

Hi Kappy,
I knew there was something about "not mixing" PPC and Intel versions of dealing with the external drive.
The drive was originally prepared on an Intel Mac mini Core Duo. But it should also mount normally on a PPC mac as an external hard drive right?
Here's the sequence of events:
1. Tried to boot from the Back Up/Clone Drive of the Mac mini Core Duo, through my MacBook Core 2 Duo, but failed to boot up
I had to shut down the MacBook (prolonged Bluescreen)
2. When I reboot the MacBook, and tried to mount the ext drive as normal, nothing happens, I knew something was wrong
3. Able to reach the vendor, use the Mac mini again to erase and reformat the drive, then check with DU, everything is OK
Clone with SuperDuper
After that check again with DU, not everything is alright, there are errors.
4. Brought the drive home, try to mount on my iMac G5, nothing happens.
I did a check on this forum, and the reply was that I should be able to use Disk Warrior 4 (Universal) on a PPC to fix an Intel-based ext drive. I was very specific and detail in my post/question
5. So anyway, I have no other option, I ran Disk Warrior 4 from my PPC iMac G5 and scan the ext drive, trying to fix it.
It reported the drive is too damaged to be replace with a new Directory, but gave me a Preview Mode. I use this to copy some data out.
But not sure if the data is OK or not.
6. After that, I was able to mount the drive in my iMac G5, so I just use DU and erase and reformat the drive, with Zero Data
7. Ran DU again, and that's where I am now, at the very first post, getting error messages that I cannot fix the drive
Thanks and cheers

Unable to unlock external drive or repair (but can change password)

I have a Freecom 1TB USB 2 external drive with a single partition with Filevault 2 encryption enabled.
The Mac Air detects the drive and prompts for the password to unlock. Prior to this problem it was retrieved automatically from my Keychain (entry still there). An incorrect password immediately gives the window shake. The correct password results in either a prompt to re-enter a password after few minutes or considerably longer.
Disk Utility (run from a standard or admin account or in recovery mode) appears to Verify and Repair the drive fine, but when the partition is selected I get:
Verifying volume “1,000”
Checking storage systemChecking volume.
disk3: Scan for Volume Headers
Invalid Volume Header @ 0: incorrect block type
Invalid Volume Header @ 999709908480: incorrect block type
disk3 is not a CoreStorage volume
Error: Storage system verify or repair failed.
The Repair option is not available.
Earlier I was getting an "Unable to examine /dev/disk3: Resource busy" message on Verifying the partition.
Earlier I also got a message in the details of drive Verify or Repair in Recovery mode of "transaction group 12: cksum mismatch", though the final result of the Verify and Repair stated the drive was okay.
Oddly I seem to be able to change the password, but nothing else including switching off encryption. When the later is attempted it appears to accept the password but then stops stating there was a problem (no other details).
I have a second external drive with Filevault2 enabled and this connects fine although a password is prompted for even though I saved it to my Keychain previously.
Suggestions very welcome! Preferrably to fix or if that is not possible ways to potentially retrieve some of the data.
Drive and Partition info from Disk Utility:
Name : Freecom Mobile Drive XXS Media
          Type :           Disk
          Partition Map Scheme :           GUID Partition Table
          Disk Identifier :           disk2
          Media Name :           Freecom Mobile Drive XXS Media
          Media Type :           Generic
          Connection Bus :           USB
          USB Serial Number :           C0001E86AA51
          Device Tree :           IODeviceTree:/PCI0@0/EHC2@1A,7
          Writable :           Yes
          Ejectable :           Yes
          Location :           External
          Total Capacity :           1 TB (1,000,204,886,016 Bytes)
          Disk Number :           2
          Partition Number :           0
          S.M.A.R.T. Status :           Not Supported
Name : 1,000
          Type :           Encrypted Logical Partition
          Disk Identifier :           disk3
          Mount Point :           Not mounted
          Disk Status :           Online
          File System :           Mac OS Extended (Journaled, Encrypted)
          Connection Bus :           USB
          Device Tree :           IODeviceTree:/PCI0@0/EHC2@1A,7
          Writable :           Yes
          Universal Unique Identifier :           7663BACA-6B14-3D7F-8C39-5A5319AE9F4B
          Capacity :           999.71 GB (999,709,908,992 Bytes)
          Owners Enabled :           No
          Can Turn Owners Off :           Yes
          Can Be Formatted :           Yes
          Bootable :           Yes
          Supports Journaling :           Yes
          Journaled :           No
          Disk Number :           3
          Partition Number :           0

I'll answer my own question, which may help others.
I found no solution and reformatted the drive.
Not sure if my question was poorly worded but after no response I tried one of the main paid support sites. The expert who took up my question didn't seem at first to be aware of encrypting external drives under Lion. No viable solution was found, so I gave up and reformatted the drives.
This is the third time I have had issues with the stability of OSX formatted external drives, so enough is enough. I'm sticking with FAT32 (the 4Gb limit isn't a major problem) for all my drives except my Time Machine drive. No encryption on that drive either.

I can read but I can't write to an external drive - changing permissions

I can read but I can't write to an external drive.
How do I change permissions? None of the helps here on the discussions have helped.
Why would a computer company let me read files but not write? Hahaha. This is insane.
I have to write computer files for work. It's a project due this morning.
Man, I'm going to have to go back to PC.
Just need the compter to write files.

If it's formatted as NTFS, reformat it as MS-DOS, exFAT, or Mac OS Extended (Journaled) as desired.
If it's formatted as FAT32 or exFAT, use the Disk Utility's Repair Disk command on it.
If it's formatted as Mac OS Extended, click Authenticate and provide your administrator password, or change the permissions on that specific folder in its Get Info window.
(72460)

Windows NTFS External Drive and Permissions

Hello,
I have a 250 gig Maxtor OneTouch I use for storing/backing up files from my PC (Windows XP Home Edition) In the past I have been able to use my external drives on both my Mac and PC without any problems. This time, however when I connect the drive, it mounts, but I only have "Read Only" access. I'm currenty using 10.3.9 and I am the administrator. Is this something I'm going to have to change in the PC or can I do it from the Mac? Thanks in advance!
Heres the info from Disk Utility:
Name : OneTouch4
Type : Volume
Disk Identifier : disk3s1
Mount Point : /Volumes/OneTouch4
File System : Winows NT Filesystem
Connection Bus : USB
IO Content : Windows_NTFS
Writable : No
Capacity : 232.9 GB (250,056,705,024 Bytes)
Free Space : 216.3 GB (232,248,385,536 Bytes)
Used : 16.6 GB (17,808,318,464 Bytes)
Number of Files : 3,680
Number of Folders : 0
Permissions Enabled : Yes
Can Turn Permissions Off : No
Can Repair Permissions : No
Can Be Verified : No
Can Be Repaired : No
Can Be Formatted : No
Bootable : No
Supports Journaling : No
Journaled : No
Disk Number : 3
Partition Number : 1

Well, no I hadn't written to this drive from the Mac in the past. It was a new drive and I used it on the PC first. Would it be possible to maybe create a new partition, either on the Mac or the PC in a Mac readable format without destroying the information currently on it?

External Drive "Disk Erase Failed"

Hi All,
This is my first post to the supportcommunity and want to confirm i have searched around and while i found similar stories to my own, i did not find anything specifically helpful.
Recently i had the bright idea of moving my whole iTunes collection to a WD 500GB USB External Hard drive. The transfer was fine and iTunes was ok with the move of data. I Progressed and plugged the WD Drive in to my Airport Extreme and my Mac Book Pro recognised the drive no problems and again iTunes was able to connect to all my movies, songs etc etc.
I also tested this with my Apple TV 2 and found streaming a breeze in each room.
This morning however i noticed an error on my Apple TV 2 "Your Device does not have any movies" (or something similar), i checked my MBP and noticed the hard drive was no longer mounted nor available under the "Shared" drives list in Finder.
I tried the obvious steps first
Restart MBP
Restart APE
Restart MPB & APE after disconnecting WD Drive
Nothing above worked. I opened "Disk Utility", reconnected my WD drive directly and found my drive listed as expected. However if you see the image attached to this post you will see while my MBP recognises the drive, it does not recognise the partition created only a few days ago called "iTunes". Also the Verify Disk & Repair Disk options are not available which is a real bummer.
Finally i tried connecting the drive to a spare windows xp laptop i have, windows will start to install the device drivers which are the usual generic type and confirm the installation was complete, however My Computer does not show any drives attached.
I know i "Erased" the drive before moving my data in "Mac OS Extended (Journaled) and i did not set any security options.
I can understand Windows not recognising the drive, of course it is not NTFS or FAT32. But for my MBP to see the drive in Disk Utility and not show the partition is strange and frankly worrying.
Litterally every song, movie and TV series i ever purchased via iTunes is on that drive.
My iPhone has my music but im struggling to get that off the phone and back to my MPB, my iPad has a couple of movies but not all.
Finally i fogot to mention i tried to use disk warrior however this didnt recognise any drives other than my MAC HD.
Any help would be amazing thank you very much.

Hi guys,
Wondering if you can help me out...
I made a time machine copy on a 500gb external hard drive of my 13" MBP with a HDD currently in it.
Then took my 500gb SSD from an old 15" MBP, removed the HDD and put it in my 13" MBP.
Opened up 13" MBP in restore mode. Chose restore from time machine back up.
Choose the time machine external drive as source. Then chose the SSD drive to restore to.
Said it was erasing the drive... Asked for a password...
I typed in my usual password. It then said the SSD drive couldn't be erased.
Took the SSD out and put the original HDD back in.
Plugged the SSD into a firewire 800 caddy to try erase it in disk utility as an external.
This drive will show up in disk utility but the erase option isn't available.
I can repair the disk but it says the disk is perfectly fine.
I can click on the partition option but everything is greyed out and I can't partition it at all.
This drive will now no longer show up on the desktop or finder.
This is driving me crazy!
Just want to erase the SSD, use time machine to restore onto it and get busy.
Please help!
Thanks,
Chris

Mac os unable to format external drive

I am unable to reformat Seagate Free Agent Pro external drive used for Time Machine backup. Disk Utility gives error msg; "Couldn't unmount disk." I attempt to initialize an identical external drive and receive the same message. Any ideas?

Drive Erase for Lion/Mountain Lion
1. Restart the computer and after the chime press and hold down the COMMAND and R keys until the 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 and click on the downward pointing arrow button. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select the volume you wish to erase from the left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.

Need help with Mac & PC not recognizing external drive (disk not readable)

I am having trouble getting my computer(s) to recognize my Seagate External Drive.
Have tried on my MacBook, iMac, 2 Mini's & my roommate's PC and all reveal the same issue: The Disk you inserted was not readable by this computer.
MacBook/iMac both are working off of Leopard
Both Mini's are on Tiger
It won't show up in finder, rendering it unobtainable. I need to get the information if at all possible off of this hard drive (very important!!) so any help I can get would be greatly appreciated!
It allows me to go into disk utility where it shows up with this information:
Name : ST316002 3A Media
Type : Disk
Partition Map Scheme : Master Boot Record
Disk Identifier : disk4
Media Name : ST316002 3A Media
Media Type : Generic
Connection Bus : USB
USB Serial Number : 3LJ07T540000
Device Tree : /PCI0@0/USB7@1D,7/@4:0
Writable : Yes
Ejectable : Yes
Mac OS 9 Drivers Installed : No
Location : External
Total Capacity : 149.1 GB (160,041,885,696 Bytes)
S.M.A.R.T. Status : Not Supported
Disk Number : 4
Partition Number : 0
And it is in the "about this mac" section with this information:
Seagate Mass Storage:
Capacity: 149.05 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk4
Version: 0.00
Bus Power (mA): 500
Speed: Up to 480 Mb/sec
Manufacturer: Seagate
Mac OS 9 Drivers: No
Partition Map Type: MBR (Master Boot Record)
Product ID: 0x0500
Serial Number: 3LJ07T540000
S.M.A.R.T. status: Not Supported
Vendor ID: 0x0bc2

Additional info:
on the disk4s1 info in disk utility, this information is seen:
Name : disk4s1
Type : Volume
Disk Identifier : disk4s1
Mount Point : Not mounted
Connection Bus : USB
Device Tree : /PCI0@0/USB7@1D,7/@4:1
Writable : Yes
Capacity : 149.0 GB (160,022,790,144 Bytes)
Owners Enabled : No
Can Turn Owners Off : No
Can Be Formatted : No
Bootable : No
Supports Journaling : No
Journaled : No
Disk Number : 4
Partition Number : 1
so it looks like a whole lot of no's that need to be turned around! I can't understand why it won't be read by either Mac or PC with all of this, or how I can fix it

Shared external drive - user permissions setup

I've set a home LAN made of 3 iMac/eMac connected via Airport. I've recently added a 500 Gb firewire external drive connected to my iMac to manage backups. I divided it into 3 partitions (1 per user/xMac) and mounted them using sharepoints. It's all great; users can see, mount and use all partitions.
Here is the issue: I would like each user to only see and use his dedicated partition. I believe I must play with users and groups, but could not make it to work. I'm not very familiar with this and I'm afraid to make big mistake. Coud somebody help on this ?
iMac Mac OS X (10.4.9)

I should write one, but it's fairly simple once you get into it...
Click on the Groups tab, make a group name... say "PartitionA", click add group, repeat for 2 more groups... "PartitionB", "PartitionC".
Click on the Users & Public Tab, fill in for "Tom, "Dick", & "Harry".
Back to the Goups tab, higlight "PartitionA", then highlight "Tom", click the plus sign... repeat for the other two groups and users.
Now under "Normal Shares" tab, you can highlight a Share, then click on the Show File Properties button and assign a Group, and it's Permissions.

OS X extern drive ownership/permissions and NFS exporting

- I have an external (250GB) firewire drive on OS X 10.4.9.
- I want to have it available to local users of this Mac but with ownership/permissions of created files/directories protected in the usual UNIX sense of unique UID/GID -- files/directories created by one user cannot be read/written by other users of this Mac except as allowed by standard UNIX permissions groups settings; eg., those set with 'chmod' command.
- I want to NFS-server this drive volume to a linux NFS client (eg., RHEL 4), again with files/directories protected in this same UID/GID UNIX sense. In our case, the users' UID/GIDs will be made to match, but regardless, I wish likewise for file/directory use on the linux client to be restricted as per UNIX permissions and the files/directories created by the Mac users have protections remain in place against linux user access, and visa versa, as above.
Is this feasable in Mac OS X (without OS X Server)?
How does one go about acheiving it?
I have basic Netinfo Manager skills for creating NFS exports and starting NFS daemon services, but am not expert on all available export options. I have average linux IT NFS server/client and user management skills.
Thanks,
-Neil

I don't know about networking with Linux, but I don know that for OS X users, enforcing permissions on an external drive without OS X Server is tricky.
First, log in to your admin account. Right-click the drive, Get Info, expand Ownership & Permissions, and uncheck "Ignore ownership on this volume". Then set permissions accordingly.
The problem is that any unprivileged user can log in to his own account, Get Info, recheck the box, and get ownership of the entire contents of the drive. This is possible even without the admin password.
There is a workaround that will remove the Ignore Ownership box from the Get Info panel so that there will be no box for them to check. First make sure that the box is unchecked and that the permissions are set how you want. Then enable ACLs on the volume by entering this command in a Terminal window:
sudo fsaclctl -p /Volumes/volumename -e
Then restart Finder. Now there's no box for the unprivileged user to check. But I don't know where this setting is stored; perhaps the unprivileged user can find some command-line way of getting the box re-checked and thus getting ownership of everything.
If there is some way you can get the data off of the external drive and onto the main boot drive you will have the best chance of keeping the data safe.

Unable to access external drive.

I'm a newbie to macs. Tried to use my Maxtor One Touch III USB external hard drive which had previously been my windows backup drive, on my new mac. Copied all the files to the mac, reformatted it with Mac Extended and then copied the files back over to the drive. Everything was fine until I installed the "proper drivers" for the Maxtor drive and now the drive isn't recognized at all by the mac. A call to maxtor revealed that the USB drive is not supported on mac. My question is is there any way to "uninstall" these new drivers I installed and revert back to the native mac driver that originally recognized the drive? Any other ideas?

Congrats on the new iMac 24" and welcome to Apple Discussions... you've come to the right place.
Have you tried doing a search for the external drive software (drivers)? If not, click the round (blue or gray) icon top right of your screen, that is Spotlight. In the drop down search field type in the name of the software. Hopefully it will return the names of the files and where they are. If you locate the Maxtor files, drag them to the Trash.
If you get that far... go here and download a new driver for Macintosh:
http://maxtorsolutions.seagatestorage.com/?elqPURLPage=1773?lid=g00246&gclid=CMn 97f-BtYwCFQNQEgodhxTbSA
Also, if you are a "switcher" .. good info here: http://www.apple.com/support/switch101/
Carolyn

Unable to repair degraded Virtual disks in Storage Spaces 2012R2

Hi all,
I have an anoying problem that I cannot seems to find a solution for.
I have a 2 node Failover Cluster with CSV-volumes consisting of 2 HP DL360 servers with 2 LSI 9300-16e HBAs each, connected to 3 Supermicro JBOD-cases with a total of 84 disks. With Storage spaces I have made 1 Pool with 6 virtual disks and 3 of these disks
are Degraded. However, when I look at the physical disks they are all fine and healthy, if I try to repair the disks it finishes without any error messages but the disk is still Degraded.
OS = Windows Server 2012R2
Anyone have an idea?
Thanks!

Hello Partner,
Thanks so much for contacting Microsoft. This is Sophia who will help you with this issue.
From your description, I learnt that the issue you are experiencing is that you failed to repair degraded Virtual disks in Storage Spaces 2012 R2. Please let me
know if I misunderstand anything.
First of all, I would like to suggest you install the following hotfix to upgrade storage related files to the newest edition. After that, please test how the issue
goes.
==========================================
Package: This is to upgrade NTFS.sys.
KB Article Number(s): 2996802
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix524134/9600/free/480025_intl_x64_zip.exe)
Package: This is to upgrade Msiscsi.sys
KB Article Number(s): 3000123
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix524132/9600/free/479758_intl_x64_zip.exe)
Package: This is to upgrade MSDSM.sys & MPIO.SYS
KB Article Number(s): 2914743
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix525821/9600/free/479581_intl_x64_zip.exe)
Best regards,
Sophia Sun
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External drive - disk utility won't display long - can't repair

Long time mac user --- this one has me stumped.
I have an external disk that I'm using for time machine. USB3.
Sometimes I'm in a hurry and I don't disconnect it properly. Looks like that's messed up the drive - I get "disk not ejected properly" now. Fine. That happens. Reformat, repair, apply journal, whatever.
But the drive doesn't show up in disk utility or `diskutil list`. Or, it does show up, for almost exactly 10 seconds. Although, now, it seems to show up for only about 2 seconds. Too little time to click on it and try to repair it.
I see the drive pop in, 'disk1', and in diskutil list, then vanishes. In the diskutil GUI, it shows up for less time than that, maybe only a second or two. Then the dreaded "Disk not ejected properly" dialog shows up. Every once in a while, OSX seems to retry and the disk pops up. When it does, it's read enough volume information to see that there is a controller, it's found a disk of the right size, it knows about the old volume, and then it vanishes. again.
Any tips? How do I "nuke from orbit" if disk utility keeps vanishing the disk before I can click on it. Lay in wait and hope a click hits it?
There must be a better way.....

Love the resounding silence here.
The problem was hardware. Even though putting in a different disk to the dock seemed to work, that would detach after about 3 minutes.
Buying a new dock and switching to it solved the problem.
I wish I knew which system log would have helped me trouble shoot this without having to buy another doc, but at least it's not a software problem.

External Drive Disk Erase Failed with the Error Input/Output Error

I have 2 hard drives in an external FW800 enclosure that I am unable to format. When I go to initialize the drives in Disk Utility, I get the following error message: "Disk Erase failed with the error: Input/output error."
The drives show up in Disk Utility, but I can't repair them (that option is grayed out). Disk Utility correctly ID's the manufacturer of the drives (Maxtor), their size (200gb each), so it's obviously seeing that the drives are there. But it won't let me format them.
The drives are new, by the way; they don't have any data/files on them. I have Disk Warrior, but the drives don't show up there to be repaired -- probably because they aren't formatted yet.
After looking at other posts, I tried switching the jumper settings around on the drives -- from Master/Slave to cable select and back again, but it didn't help. I also tried doing a zero erase (even though the drives are new), zapping the PRAM -- again, no help.
One question I had is whether this could be a bad FW800 cable? The cable is new -- it came with the enclosure, which is an OWC Dual FW 800 enclosure. Other than that, does anyone have any other thoughts about what's causing this? Any help would be greatly appreciated.
Matthew

SOLUTION!!!!
I had the exact same problem. I have the original 20 GB hard drive that came in my Powerbook G4 550MHz and a couple of years ago I traded up for a 60 GB drive and bought a FW/USB enclosure for my original drive to use it to backup my important files. I hadn't backed up in over a year (shame on me!) and I decided maybe I should erase the drive and start from scratch. It was connected via USB.
At that point DiskUtility gave me the exact same Input/Output error. I tried partitioning the drive into 1 or more partitions but came up with the same error. I couldn't figure out what was wrong so I decided to startup in OS 9.2.2, I did that and let it start up, then plugged in the hard drive and it gave me the standard "This disk is unrecognizable, do you want to eject or erase?" so I clicked Initalize. It worked!
Just make sure you choose the MacOS Extended option when initializing out of OS 9 (instead of the MacOS Standard option) so it can be read and viewed in OS X.
If your computer is too new to be able to boot from an OS 9 folder on your drive or an OS 9 CD, then see if a friend or a local library has older computers that are running OS 9 or can boot from it. If not let me know and you can send me your drive and I'll reformat it.
Kind of crazy...I haven't used the OS 9 partition on my HD in YEARS...was even thinking about erasing it since I don't use any Classic applications anymore...good thing I didn't!
Nick
Powerbook G4 550Mhz Mac OS X (10.4.6)

Unable to repair External Drive disk permissions

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