Akai S1000 / S1100 samplers

hi there!

i own a S1000 (latest OS) and have a hard disk connected via scsi, which
works fine. now i'd like to add an external cd rom drive to the setup to
be able to load ready made programs to the system. i have no clue what
works here. so i have some questions:

-are there any recommendations about which drive to use?

- i assume i can hook it up to the hard disk via scsi (daisy chained)
and give it just another id device number?

- could someone please also recommend any changeable hard disk or maybe
point me to where i can read more about it. i'd like to get one of these
too and just know vaguely that they're from syquest (seem to be good,
no?) but i actually don't know anything regarding recommended size,
medium or whatever.

maybe some of you have some experience with these? thanks for reading!

best,

roger