I have three eIDE drives that I would like to use on my computer by being able to plug them into a slot in a case bay insert individually, as I want to boot to that drive.  My PC already has two hard drives connected via a Trios~Drive selector switch and I would like this third bay insert hooked to the third position on the switch.   I have two hot swap trays for Bytecc SNT-1122 but am unable to locate a bay insert for the trays.
Plus I'm uncertain that I would be able to boot to a hot swap device....
If I could boot to it then finding a bay insert and nuthuh tray would be the best option for me.   ANYONE got any pointers tips comments?  Thanx %:)) SW You can boot to any IDE drive. You BIOS should let you select from at least two hard drives after POST. On some PCs, you hit nF12 before the OS starts and the BIOS gives you a choice of boot devices.

They are called "Hot Swap Drives", but the term does not mean you can remove it any time with no problem. They are mechanical devices with no software hooks.
Doing a Google search on the term brings mixed results. Some articles with warn you that you have to have an OS that SUPPORTS this.

Yes, I know you know that already. Just PUT that hear to let others know it is not exactly what one might think.

From personal experience, if one does not buy the items in sets, it can be hard to find an extra part later.

These are available from the major vendors
Hard Drive Rack & Mobile Removable Tray 3.5 IDE ATA 133
Thanks I hadn't found that store yet.  I'm having a hard time deciding if any of them are reputable so I won't get ripped off.   Very low income on disability!  It's all so complicated for me to figure out.
Do you know if it has any HARDWARE associated with it [as maybe the hot swap BOARD on inside/ my Bytecc-1122 tray has a circuit board in it and this unit looks suprizingly similar] that might prevent booting to the drive in it?  I want a 5.25" Bay insert with removable trays to be able to plug in different drives and boot to the OS on them.  My PC has a Trios boot selector switch with two positions occupied by fixed drives and I want the third position to have capabilities of swapping drives via tray removal and insertion...  I would preferably like to use my Bytecc trays also.
Wonder why I wasn't notified of this reply I selected notifications!?!Understood. So am I.
Here is my recommendation.
http://geek9pm.com/test/no-tray.jpg
It is a picture of a new design that does not require a tray
Sorry, it does not come in IDE, just SATA.   

So with the IDE you have to buy a rack and two trays. But what I do is just use one rack and tray. When  I want to change, I have to remove the IDE from the tray and place another drive in the tray. It still beats opening up the PC case every time.
You can find these on New egg and Amazon and other vendors. The IDE models are kind of pricey, almost as much as a new drive.

I will not recommend buying this kind of ting from eBay. You want something the really works well.

BTW, the EASUS drive partition software is now free. If you have a very large drive  you can partition it and have up to four OS on one drive. But EASUS t is not a boot manager, yet it does help re-size existing drive partitions  without losing data.
http://www.partition-tool.com

I have one system that boots
Windows XP
Vista
Ubuntu
Off of one big drive.