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Full Discussion: Filesystem Problems with DMG
Special Forums Hardware Filesystems, Disks and Memory Filesystem Problems with DMG Post 302737235 by Imhotep1963 on Wednesday 28th of November 2012 02:14:03 PM
Old 11-28-2012
Filesystem Problems with DMG
Hi all! I have a task that has been giving me problems.I have my sister-in-law's external hard drive that has been damaged and the filesystem is not mountable.

I am on a Mac running OSX 10.6.8

Using ddrescue, I recovered the contents and transferred to my external drive:

Code:
sudo ddrescue -v /dev/disk5 /volumes/backup/jj-recover.dmg jj-recover.log

Upon completion, I tried to mount the image by double-clicking it but received the error:

Code:
"No mountable filesystem"

So I tried using hdiutil:
Code:
sudo hdiutil attach -nomount /volumes/backup/jj-recover.dmg

Success!
Code:
/dev/disk6

So I try to mount:

Code:
sudo mkdir /volumes/jj-drive
sudo mount -t hfs -r /dev/disk6 /volumes/jj-drive

Error

Code:
hfs: failed to load catalog file

So I ran Testdisk and got this information:

Code:
Disk /dev/rdisk5 - 1000 GB / 931 GiB - 1953525168 sectors                       
     Partition               Start        End    Size in sectors                
>P CramFS                 313874337  319333484    5459148 [     L  ^Og~Yo]      
 P HFS+                  1952521844 1953058783     536940


1952521844
1953058783

So here I am debating what to do. I was hoping that someone may have had similar issue or may have some recommendation as to what to do next.

I appreciate any and all help!!

Thank you!
 

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LEARN ABOUT NETBSD

fsck_msdos

FSCK_MSDOS(8)						    BSD System Manager's Manual 					     FSCK_MSDOS(8)

NAME

     fsck_msdos -- DOS/Windows (FAT) filesystem consistency checker

SYNOPSIS

     fsck_msdos -p [-f] filesystem ...
     fsck_msdos [-fny] [-x snap-backup] filesystem ...

DESCRIPTION

     The fsck_msdos utility verifies and repairs FAT filesystems (more commonly known as DOS filesystems).

     The first form of fsck_msdos preens the specified filesystems.  It is normally started by fsck(8) run from /etc/rc during automatic reboot,
     when a FAT filesystem is detected.  When preening file systems, fsck_msdos will fix common inconsistencies non-interactively.  If more seri-
     ous problems are found, fsck_msdos does not try to fix them, indicates that it was not successful, and exits.

     The second form of fsck_msdos checks the specified file systems and tries to repair all detected inconsistencies, requesting confirmation
     before making any changes.

     The options are as follows:

     -f 	       This option is ignored by fsck_msdos, and is present only for compatibility with programs that check other file system
		       types for consistency, such as fsck_ffs(8).

     -n 	       Causes fsck_msdos to assume no as the answer to all operator questions, except ``CONTINUE?''.

     -p 	       Preen the specified filesystems.

     -x snap-backup    Use a snapshot with snap-backup as backup to check a read-write mounted filesystem.  Must be used with -n.  See fss(4) for
		       more details.  The point is to check an internally-consistent version of the filesystem to find out if it is damaged; on
		       failure one should unmount the filesystem and repair it.

     -y 	       Causes fsck_msdos to assume yes as the answer to all operator questions.

SEE ALSO

     fss(4), fsck(8), fsck_ffs(8), mount_msdos(8)

BUGS

     fsck_msdos is still under construction.

BSD
								  April 11, 2010							       BSD
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