Firstly, I would like to say that this cage is for my iMac (The iMac forum didn't reply) but figured owners of Mac Pros would know more about large types of storage. I've got 4 hard drives lying around my room from my old PC, and would like them all in a cage of sorts sitting next to my iMac. 3 of the drives are data and the 4th drive will be reformatted as a time machine backup. I've mroogled this and strangely couldn't find information about external hard drive cages. I don't think I need or want Raid either, do I? Thanks for making it this far. To reiterate: Looking for an external hard drive bay that supports 4-5 3.5' drives where 3 have data and the other will be used for backup. Any help will be appreciated, thank you.