Write & Read Permission

Question

Shortly after starting up my Macbook this morning Time Machine failed to backup on my Western Digital 320GB My Passport saying that I did not have permission and that it was read only. This was a surprise to me because last night it backed up just fine and no preferences changed.
What could be the problem? Should I run a Disk Repair through Disk Utility?

Answer 1

Hello, I just started having the same problem with my iMac and external WD 500G drive. Time machine worked fine last night but this morning the disk is read only and can no longer be written on. In Disk Utility, repair is not available, nor is repair permissions. When I try to run Verify, it is unable to finish the process. I've included the list from Disk Utility. I have also tried to verify/repair with Drive Genius 2, but to no avail. The process always stops because of overlapping extents (extent 3 overlaps extent 2 by 1873 blocks).
Verifying volume “Time Machine”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Incorrect block count for file iNode381520
(It should be 4 instead of 2)
Incorrect block count for file iNode381522
(It should be 3 instead of 2)
Incorrect block count for file iNode381523
(It should be 2 instead of 1)
Incorrect block count for file iNode381524
(It should be 1 instead of 2)
Incorrect block count for file iNode381525
(It should be 2 instead of 1)
Incorrect block count for file iNode381526
(It should be 1 instead of 2)
Incorrect block count for file iNode381527
(It should be 1 instead of 3)
Incorrect block count for file iNode381529
(It should be 1 instead of 2)
Incorrect block count for file iNode381531
(It should be 1 instead of 2)
Incorrect block count for file iNode381532
(It should be 7 instead of 1)
Incorrect block count for file iNode381533
(It should be 4 instead of 2)
Incorrect block count for file iNode381534
(It should be 1 instead of 2)
Incorrect block count for file iNode381535
(It should be 1 instead of 2)
Incorrect block count for file iNode385591
(It should be 1 instead of 2)
Incorrect block count for file iNode385592
(It should be 1 instead of 2)
Incorrect block count for file iNode385594
(It should be 1 instead of 2)
Incorrect block count for file iNode385595
(It should be 1 instead of 2)
Incorrect block count for file iNode385596
(It should be 1 instead of 2)
Incorrect block count for file iNode385598
(It should be 3 instead of 2)
Incorrect block count for file iNode385601
(It should be 4 instead of 1)
Incorrect block count for file iNode385603
(It should be 1 instead of 2)
Incorrect block count for file iNode390731
(It should be 6 instead of 2)
Incorrect block count for file iNode390732
(It should be 5 instead of 2)
Incorrect block count for file iNode390733
(It should be 2 instead of 3)
Incorrect block count for file iNode390846
(It should be 1 instead of 2)
Incorrect block count for file iNode3908919
(It should be 2 instead of 1)
Incorrect block count for file iNode391244
(It should be 15 instead of 1)
Incorrect block count for file iNode391247
(It should be 3 instead of 2)
Incorrect block count for file iNode391248
(It should be 3 instead of 2)
Incorrect block count for file iNode391249
(It should be 2 instead of 4)
Incorrect block count for file iNode391250
(It should be 4 instead of 2)
Incorrect block count for file iNode391251
(It should be 1 instead of 3)
Incorrect block count for file iNode393264
(It should be 1 instead of 2)
Incorrect block count for file iNode394518
(It should be 4 instead of 2)
Incorrect block count for file iNode394519
(It should be 2 instead of 4)
Incorrect block count for file iNode394521
(It should be 4 instead of 2)
Incorrect block count for file iNode394523
(It should be 7 instead of 2)
Incorrect block count for file iNode394525
(It should be 1 instead of 2)
Incorrect block count for file iNode394526
(It should be 4 instead of 1)
Incorrect block count for file iNode394527
(It should be 1 instead of 2)
Incorrect block count for file iNode394528
(It should be 1 instead of 2)
Incorrect block count for file iNode394529
(It should be 2 instead of 1)
Incorrect block count for file iNode394530
(It should be 1 instead of 2)
Incorrect block count for file iNode394531
(It should be 8 instead of 2)
Invalid node structure
Volume check failed.
Error: Filesystem verify or repair failed.
Any suggestions would really help.
Thanks so much guys.
J