'No mountable file systems' when mounting FAT 16 DMGs

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'No mountable file systems' when mounting FAT 16 DMGs

I'm having great difficulty mounting any FAT16 DMGs on my Mac. I've tried them on a friends Mac, the same files, same operating system version, same version of hdiutil, and they mount no problem. Mac OS extended file system DMGs will mount OK on my Mac, I've not tried FAT32.

Below is an example of the output from

hdiutil mount MacFUSE-2.1.dmg -verbose

Initializing…
DIBackingStoreInstantiatorProbe: interface 0, score 100, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface 1, score -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface 2, score -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface 3, score 100, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface 4, score -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface 5, score -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface 6, score -1000, CVectoredBackingStore
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
Attaching…
Error 109 (no mountable file systems).
Finishing…
DIHLDiskImageAttach() returned 109
hdiutil: mount failed - no mountable file systems

I've tried reboot, the disk utility to repair the disk, repairing permissions and even used Disk Warrior but to no avail. I've seen many posts with similar symptoms but no solution.

BTW. I have MacFuse version 2.1.5 & NTFS-3G installed.

Any help greatly appreciated, I'm at the end of my tether with this one 😟 Thanks

MacBook Pro, Mac OS X (10.6.6)

Posted on Feb 12, 2011 1:14 AM

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Answer 1

YelloPeril Author

Level 1

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Feb 15, 2011 11:03 AM in response to YelloPeril

There's more.. I think my Mac is misinterpreting the underlying file system of the .DMG file. For example the MacFUSE-2.0.3,2.dmg file is MacOS extended on a Mac where it mounts, but my Mac thinks it's MS-DOS (FAT16)!
So can anyone help me now? Why is my Mac getting the file format wrong for the .DMG's that I'm trying to mount??

Any help please??

Cheers

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Answer 2

KJK555

Level 4

2,900 points

Feb 15, 2011 11:34 AM in response to YelloPeril

ntfs-3g should make no difference, is only for ntfs.

be sure the .dmg has correct perms (on the .dmg file):

owner:<you>
group:admin or staff
attributes: -rw-r--r-- (chmod 644)

http://support.apple.com/kb/ht2963

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Answer 3

YelloPeril Author

Level 1

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Feb 15, 2011 11:41 AM in response to KJK555

Thanks for the help but my DMG files appear to have the correct permissions, attributes and ownership..

Cheers

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Answer 4

KJK555

Level 4

2,900 points

Feb 15, 2011 12:05 PM in response to YelloPeril

In that case, maybe your user account suffers corruption.

To test: create a new (2nd) user account, see if the problem goes away when logged in to the new
account.

Kj

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Answer 5

YelloPeril Author

Level 1

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Feb 16, 2011 11:38 AM in response to KJK555

Hi Kj
thanks again for your suggestions. I've created another account, logged in with that and it doesn't resolve the issue.. Not sure what else to try apart from re-imaging the Mac. This I'm trying to avoid! Thanks.

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Answer 6

KJK555

Level 4

2,900 points

Feb 16, 2011 5:18 PM in response to YelloPeril

Do a reinstall. You can reinstall Mac OS X while keeping your files and user settings intact:

http://docs.info.apple.com/article.html?path=Mac/10.6/en/8177.html

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Answer 7

YelloPeril Author

Level 1

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Feb 17, 2011 9:36 AM in response to KJK555

OK. Sounds like that's the next step.. Thanks again

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Answer 8

Mar 6, 2011 11:38 PM in response to YelloPeril

I am not a high level pro in this but there are two options that you can try.
1. you can use third party that can mount FAT16 DMGs on your Mac.

visit http://www.google.com/search?q=mountdmg+on+macsoftware&start=0&start=0&ie=utf-8&oe=utf-8&rlz=1R1GGLLen__IN421

2. This problem also occur due to the problem in the Mac OS X and in this situation you should use macintosh data recovery application.Since the OS can not find the system in proper format, this problem occurs. You can get the software from here, http://www.nomountablefilesystems.com

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Answer 9

Oct 9, 2011 12:56 PM in response to YelloPeril

I get the same issue on some .dmg files. After some investigation, it only occurs with files where the partition file system is DOS_FAT_16. It works OK when it is APPLE_HFS.

Anyone has a solution?

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