Are you talking about one of those modern hot-swappable drive bay things? The kind where a whole hard drive gets popped out of a case's drive bay and transferred between machines? I'm not sure the Amiga can use those...
External cartridge drives, like Zip, SyQuest, etc., are fine, of course. The disks are hot-swappable (depending on the SCSI controller), but the drives aren't (since you shouldn't unplug things from an Amiga while it's on). External USB drives are fully hot-swappable, but slower, due to bandwidth limitations.
I think you'll get more out of TCP/IP. Eliminate sneakernet once and for all. And open up the possibility of network printing :-)
