Q: I have a Seagate Backup and all of a sudden all my files have disapeared from it.  My MacBook Pro shows nothing in it but it shows it's full.  Missing hundreds of Photo's.

Sorry, this did not work     If gave me an error:  Unable to unmount volume for repair.

The same error occured in the partition where my photo's are at.

Sorry I marked that this was solved and I don't know how to change the solved check-mark.

I think both sites you sent me to is on the technical side.  I think I might have to have someone else try to get my photo's back.  What a bummer, especially when I've read how much trouble people have had with the Seagate External Hard Drive.  This happened once before just to my photo's and all I did was unplug it and then plugged it in again and everything was all there.  Should have backed the photo's up to another drive then.  Don't know if Yosemite had something to do with the whole thing disappearing or not.

Tried to get my photo's back and my Time Machine on my external drive by using the below procedure.

Open Disk Utility and run First Aid - Verify and Repair on the drive.

I tried it on my Time Machine - If gave me an error:  Unable to unmount volume for repair.  That error was also repeated on the Photo's drive and the Windows drive.

I think I will close down my external drive and unplug it and replug it back in and see what happens.  But when I try to reject it this pops up  The disk "Windows" wasn't ejected because one or more programs may be using it; Photo's, wasn't ejected because one or more programs may be using it; Time Machine wasn't ejected because one or more programs may be using it.  It then asks if I want to force eject each one.  Should I go ahead and force close - each one and see what happens?

Let me know what you think??