In regards to JDW's comment, I have an 80 meg Quantum drive, which was probably designed for an SE/30, or a Classic II. I am not sure if it works, as I have not tested it out in a while (it was supposed to be a replacement for the internal 40 meg Lacie drive I have in my SE, but that never happened).
Although I would like to keep the SC20 with its stock 20-meg drive, can I potentially swap the 20-meg with the 80 (just to see if it works)?
Thanks again for the replies.