If you have one drive that works and the other causes the computer to hang, my guess would be that the non-working drive is dead, and probably beyond repair. Most likely, you will not be able to save the data on the drive, unless you take it to a data recovery specialist, which will cost $$$$. Don't you have backups of your music?
You should switch to using the working drive, and as soon as possible you should hack your Keg so you can easily replace any drive that fails.