Akai S1000 / S1100 samplers

Hello everyone, I really appreciate the helpful responses to my 
question about adding RAM to my Akai S1000HD.  Ya' know, the unit has 
not even arrived yet, and I am already trying to make plans to improve 
it... LOL

I also wanted to ask about adding a CD-ROM drive and and an External 
Hard Drive, please.  The Akai S1000HD has already had a few upgrades... 
This is what the former owner wrote about it, in the EBay auction:

BOTH SCSI & DIGITAL AES/EBU OPTICAL OUT CARDS ARE INSTALLED! OS 4.40. 
INCLUDES MANUAL, POWER CORD & BOX. 16 MB RAM (UP TO 32) & 40 MB HD

So, when I want to add an external HD, is there a particular hard drive 
that ya'll would recommend?  And when I add a CD-ROM drive (for loading 
my S1000 sample CDs), what would be the best way to go about picking 
the one that'll work best for this sampler?

Thanks again for all your tremendous help!

Gary