If you didn't even hear it spinning, are you sure you connected it correct? =)
I'm currently using an old 20GB drive in my Amiga 600 withut issues, but I dont know if it's EIDE or not.
Here you can read some more about EIDE, it's apparently quite confusing =)
http://www.pcguide.com/ref/hdd/if/ide/unstdEIDE-c.html The compact flash things can be found at amigakit or ebay, I'm thinking of buying one for my Amiga 1200 that I've just bought.
