Alright, so I've been using my external HD for almost a year now and its been pretty good, up until last night. I had a very odd issue with the entirety of my mac involving the permissions, basically no matter how much I changed the permissions to read and write for ANY file it would always revert to read only on my mac. With the external harddrive reading "custom" permissions. So I ran disk utility to repair the permissions and the history went on and on it seemed like it was repairing everything, but it didn't resolve anything. So I booted from the disk and clicked repair permissions and the disk from there. It completed so I restarted and was hit with a "kernal panic" or whatever basically that grey screen telling me to restart in 4 languages, restarted and same issue. So I booted back from the disk, and ran time machine, oddly enough I could access my backups from time machine on the disk and I went back 48 hours hoping that would resolve it. It did, I managed to get back on my machine with no issues what so ever. Sadly however my backup drive is still reading the same issue and I can't back up to it anymore. The last thing I want to do is reformat it, I use time machine like a priest uses the bible and I'm going through older versions of my work all the time. Reformatting now will get rid of months and months of this. But at this point the backup is rendered useless. Is there anyway to repair without a complete clean? error message upon opening my backup error message upon trying to backup icon of backup drive Can anyone shed some light? TL;DR My external harddrive won't let me unlock it to use it. Any way to fix this?