ALOHA
I'm a Big removable HD fan.My current system has internal HD w\w2kpro installed.I only have 1 removable bay now(need more).
A modern MB is also important~My Abit Kt7raid.I set Bios HD to auto detect and Bios boot choices to CD-disc1-disc0.
This way my sys will boot off Cd if I need or bypass to the removable HD Boot first(XP Pro) if there is a boot sector on the HD in the bay.
If the bay contains only a storage HD~No Boot sector it proceeds to my internal HD and boots w2k(My personal Fav).
When I want to use my internal HD and still read the files on my removableHD with a boot sector I simply adjust the bios to boot disc0 first.
Also removable HD trays(good ones)have at least 1 fan that lowers HD temp a lot.
Hot swap is available but I sadly don't have the software Yet.
*I do however setup new HD OSes by themselves no other drives running as sometimes something automated may install on the wrong drive*
ALOHA