I've read several threads here about fixing permissions to unlock a drive that has become locked as readonly. I have tried running the suggested commands in terminal to no avail. This is an external drive, worked fine before, never hooked to a pc - mac only all its life. Now, get info shows that it is Read Only. The lock icon is not clickable. Looking at permissions in terminal the world bit has a "t" rather than an "x" and it also has a "@": Code: drwxrwxr-t@ 36 Jake staff 1292 Aug 13 2011 backup box when I try running the various permission changing commands I've found in different threads on this forum, no change is made and the feedback lets me know the disk is readonly. eg: Code: chmod: backup box/: Read-only file system TRIED: Code: sudo chflags 0 backup\ box/ chflags: backup box/: Read-only file system mac-mini:Volumes Jake$ sudo chown 0:80 backup\ box/ chown: backup box/: Read-only file system mac-mini:Volumes Jake$ sudo chmod 775 backup\ box/ chmod: backup box/: Read-only file system mac-mini:Volumes Jake$ sudo chmod -N backup\ box/ chmod: Failed to clear ACL on file backup box/: Read-only file system mac-mini:Volumes Jake$ chflags -R nouchg backup\ box/ chflags: backup box//.DS_Store: Read-only file system Tried running disk utility - repair permissions option greyed out. Tried verifying the disk. Got this error: Code: Invalid key length Volume check failed. Error: Filesystem verify or repair failed. And now I can't access the disk at all. I would appreciate any help. Thank you so much.