I replaced the optical drive in a 15" Macbook Pro (late 2011) with a new 2TB Samsung HDD in a caddy tray. It formatted fine and Disk Utility says it's OK.
The problem occurs when I try to copy a large set of files to the drive. It starts out alright, copies a few GB. Then it spontaneously unmounts in the middle of the copy and throws a
Disk not ejected properly error.
If I open Disk Utility afterwards, it doesn't even see the drive. Restarting the computer doesn't bring it back. But if I shut down and then start up, it comes back on just fine.
Normally I would assume it's just a faulty drive, but the exotic nature of the optical drive caddy makes me suspicious.
Has anyone encountered this sort of problem? What is the likely cause? Any suggestions for troubleshooting prior to returning the drive? Thanks!