Informatiom about Edirol A6/SP808

I need some Information about the Edirol A6
Harddiskrecorder with up to 19 Gb Harddisk.
I have easy updated my Roland Sp 808 to 808 ex.
Then i have a 250mb Zip Disc imstalled.
Where do i become the OS from the Edirol A6, and which Disc Drivess can i put in my Roland 808?
Thank you very much, (iam a Roland Freak)