I have 3 Western Digital Caviar Green hard drives. One 1TB, one 1.5tb, and one 2TB. I have a SATA dock (branded Kingwin ez-dock) and a 3.5" external enclosure from Acomdata.
All 3 drives work perfectly and are recognized in the Acomdata enclosure. The 1TB and 2TB work in the SATA dock. The 1.5TB drive does absolutely nothing in the dock.
I have tried it on Windows and Mac, with FAT32, HFS+, and no filesystem. This drive works just fine in the enclosure, so I know there is nothing wrong with the drive. Multiple drives work just fine in the dock, so I can only assume there is nothing wrong with the dock. The drive does spin up in the dock, so it's definitely getting power. But after about 30 seconds, it spins down and does nothing for as long as I leave it there.
What on earth is going on here?