I partitioned my hd into 3 pieces, one of which is somehow corrupt and that volume is most important. Disk utility acknowledges that it exists, but wont let me access it. it reccomends that i back it up and restore it. thats great but how do i back it up when it will not mount. im running mac os x snow leopard.
I don’t know much about Macs but maybe TestDisk http://www.cgsecurity.org/wiki/TestDisk will fix the damage.
Joe
here info, previous idea didnt work but thanks.
Actual hard drive
Name : WD My Book 1110 Media
Type :Disk
Partition Map Scheme :Master Boot Record
Disk Identifier :disk1
Media Name :WD My Book 1110 Media
Media Type :Generic
Connection Bus :USB
USB Serial Number :574D415A4130313734313730
Device Tree :IODeviceTree:/PCI0/EHC2@1A,7
Writable :Yes
Ejectable :Yes
Location :External
Total Capacity :2 TB (1,999,696,297,984 Bytes)
S.M.A.R.T. Status :Not Supported
Disk Number :1
Partition Number :0
Partition i cant access
Name : disk1s1
Type :Volume
Disk Identifier :disk1s1
Mount Point :Not mounted
File System :Mac OS Extended (Journaled)
Connection Bus :USB
Device Tree :IODeviceTree:/PCI0/EHC2@1A,7
Writable :Yes
Capacity :1.31 TB (1,306,798,100,480 Bytes)
Owners Enabled :No
Can Turn Owners Off :Yes
Can Be Formatted :Yes
Bootable :Yes
Supports Journaling :Yes
Journaled :No
Disk Number :1
Partition Number :1
Great another one just got corrupt too. here is that info
Name : disk1s2
Type :Volume
Disk Identifier :disk1s2
Mount Point :Not mounted
File System :MS-DOS (FAT)
Connection Bus :USB
Device Tree :IODeviceTree:/PCI0/EHC2@1A,7
Writable :Yes
Capacity :250 GB (250,000,003,072 Bytes)
Owners Enabled :No
Can Turn Owners Off :No
Can Be Formatted :Yes
Bootable :No
Supports Journaling :No
Journaled :No
Disk Number :1
Partition Number :2
Ideas? i just need to extract 3-4 archived files and im done. they are irreplaceable 
great now it isn’t even recognizing the hard drive at all.
Verify and Repair volume “disk3s1”
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Unused node is not erased (node = 230)
Checking catalog file.
Invalid node structure
The volume Terro Drive was found corrupt and needs to be repaired.
Volume repair complete.Updating boot support partitions for the volume as required. Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
This is my error from first aid
yup, you corrupted the drive. you can try test disk, but i think it only works on windows. you may need to find a mac utility that can restore a partition. otherwise, you can simply repartition and format the drive.
