Removable hard drives crashing in Vista

I have now had THREE hard drives crash in Vista, all having something to do with the fact that I was using them as removable drives. All drives were originally formatted in XP and worked great as removable drives in XP. Something is wrong with how Vista is setup to handle removable drives. I lost two drives using a Kingwin SATA mobile rack and then a third using a trayless SATA mobile rack from a different company. The drive just suddenly becomes inaccessible and the file system is corrupt. It shows up as a raw drive in disk manager. I know this will happen again if I don't figure out what is causing it. Any ideas what could be causing this and how to prevent it?