i am considering buying a mark 1 with a 3 gig drive. can this drive accept larger hard drives (20 gigs?). I understand there is a clearance issue with the height. Is there anything about the mark 1 that doesn't size up to the mark2?

thanks in advance
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50 Gig MK2 feat. over 7445 songs, 865 albums by 400 artists for 25 days of easy listening