Changing Dell desktops to removable drives

[Mn19.89z]

Hi,

I have several Dell desktops (745, 755, GX260, T5500, Etc) all Win7 and Server 2008, that have factory hard drives; I want to make them removable drives. In the past

I have special ordered desktops with T-7 units from Dell.

Now, I need to make about 20 desktops removable drive desktops, any ideas, Dell says I can't really add a Dell sponsored caddy / cage.

My other issue is I have to add whole disk encryption to it, TrueCrypt is perfect.

I also have to add USB tape backup unit. Q: does anyone have an USB portable tape backup unit and encrypting the hard drive and tape?

Thanks

Mn19~