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For some reason i can't access my external HDD anymore. It's not showing up in Finder, although i can see it in the Volumes folder and in Disk Utility app.

When i access the HDD from terminal and try to list the files via ls I get permission denied. I tried running

sudo chmod 755 myHDD

now ls returns nothing at all, like an empty folder. At this point I figured the first step is to try to unmount it correctly, which i tried in various ways:

Via Disk Utility: Failed and wants me to make sure nothing is in use on the HDD.

In terminal i tried these methods:

diskutil unmountDisk force myHDD

"Unmount Failed"

sudo umount /dev/disk1

"umount: /dev/disk1 not currently mounted", but it still exists in Volumes/myHDD

hdiutil detach /dev/disk1

"hdiutil: detach: timeout for DiskArbitration expired"

hdiutil eject /dev/disk1

"hdiutil: detach: timeout for DiskArbitration expired"

As you can see nothing is working for me. I can't unmount it, and when i unplug it form the computer it persists in Disk Utility.

All helps and tips are greatly appreciated!

EDIT:

Tried with to repair the disk from Disk Utility with Tuxera NTFS and got this error message:

Tuxera NTFS could not mount /dev/disk2s1 at /Volumes/VERBATIM HD because the following problem occurred:

Aligned I/O enabled. CBCIO enabled. WARNING: ReadFully - I/O error while reading from file (5: "Input/output error") WARNING: failed at: pread(3, 0x100580000, 282624, 17980981248); WARNING: bytesRead=0 ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read $UpCase, unexpected length (-1 != 131072). __ntfs_volume_release(): Inode 10 still have 1 references. Failed to mount '/dev/rdisk2s1': Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f parameter is very important! If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation for more details.

1 Answer 1

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It may be a problem with FileSystem

Are you using NTFS filesystem? Notice that OSX needs some special software to work with this FileSystem and I had some problems with it in the past.

If you are using NTFS, try to uninstall your NTFS software and install it again.

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  • Thank you for the input. It is indeed NTFS filesystem, but the weird part is that it has been working for over a year, without external NTFS software (only readable though).
    – olof
    Sep 21, 2014 at 17:18

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