When attempting to move a file from an external disk to the trash, via the Finder, I receive the warning message "The operation can't be completed because backup items can't be modified." I can not move the item to the trash. I can delete the file using the rm command via Terminal. I would like to be able to delete items from this disk, using the Finder again.
I noticed this problem shortly after upgrading from OS X 10.7 to 10.7.1.
I did see the other discussions about similar problems on Time Machine disks. This external disk, which I am trying to delete from, has never been my Time Machine disk, nor has it ever been backed up via Time Machine. I do have another external disk that is used for Time Machine
There are no problems reported by the "verify disk" function in Disk Utility.
Thank you for your time.
Correction: I subsequently foud that I could not delete ANY file through the finder (after repairing permissions with disk utility). After a mild freak-out, I calmed down and rebooted. Problem solved. Thanks!