Okay first of all, 'as usual' my external drive (used for Time Machine backup) was 'unproperly ejected' as I wake the computer up. This happens since I bought the iMac (late 2012) and the external drive (Seagate Backup Plus 1TB), although it happens more frequently after 10.8.5 and now 10.9. Today, something worse happened. It asked me to enter the password to unlock the disk (it's encrypted). I entered the password and it shakes. It won't unlock! I've checked the hint and Keychain Access, I've entered the exact correct password a few times. I even copied it from the keychain and it still won't unlock! What's going on? Is my disk corrupted? Is it related to this problem? What do I do? EDIT: I've also tried unplugging and plugging the drive back in, and it still asks for password and won't accept the (correct) password that I enter. It's also not appearing on my 'Devices' menu.