

Here's an article on three popular disk tools in OS XĪny disk will have a chance to fail over time and external disks are (usually) given harsher conditions. Unfortunately a Verify/Repair under Disk Utility is not that thorough so it will not fully test the drive like you need. ( TechTool can do this but is expensive, Scannersz Lite is a After copying/recover the original files you may want to reformatĪnd test the original disk with something like a surface scan.Get a new disk to use as a new/second backup disk.

Alternatively recover the files under Linux if you

This could be an issue with corruption of the file system/directory structure on the disk.Ī utility like Disk Warrior may be able to help you resurrect the directory structure and recover the files.
