Oh, and:

If you were sticking that old drive back into the player because you wanted to save all of your old songs from the old disk drives, there are instructions in the disk upgrade guide on how to do this. It has very specific instructions on how to use the shell prompt to copy the data from *BOTH* of the old disk drives onto the new, larger disk drive. But you would have to have done *both* for it to work. Now that you've messed up one of those old disk drives by doing some deletes and synchs, you've now lost out on the opportunity to do that as well.