I got an external hard-drive that doesn't show up on finder. On both Disk Utility and DiskWarrior it keeps mounting and un-mounting. Disk Utility when trying to repair, spits this out when it un-mounts... 2011-07-28 22:43:43 -0700: Problems were encountered during repair of the partition map 2011-07-28 22:43:43 -0700: Error: Some information was unavailable during an internal lookup. 2011-07-28 22:43:43 -0700: : Some information was unavailable during an internal lookup. 2011-07-28 22:43:43 -0700: [DUDiskController mountDisk] expecting DUDisk, but got nil On DiskWarrior it simply says 'Directory cannot be rebuilt due to disk hardware failure (-36,2747) Earlier today it would stay mounted and Disk Utility would spit out... Verify and Repair volume Back-up Hard Drive Checking file systemChecking Journaled HFS Plus volume. Checking extents overflow file. Checking catalog file. Invalid sibling link Rebuilding catalog B-tree. Invalid node structure The volume Back-up Hard Drive could not be repaired. Volume repair complete. Updating boot support partitions for the volume as required. Error: Disk Utility cant repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. while DiskWarrior would try to fix it, but on Step 5: Locating directory date... Speed reduced by disk malfunction: 339,474, er make that 340,239, er make that 341,327 and I finally gave up there. I try to fix the Invalid sibling link error via Terminal and I get this... imac-2:~ Migrated$ fsck_hfs -r /dev/disk2s2 ** /dev/rdisk2s2 (NO WRITE) Can't open /dev/rdisk2s2: Resource busy Is there ANY THING I can do to get it to stay mounted and possibly fix this? This is my back-up hard-drive!!