If it's TWO ribbon cables going to the drive, a wide 34-pin and a narrower
(20-? 24-? pin) then it's either MFM, RLL, or ESDI.
A single 40-pin ribbon cable would be an ATA "AT Attachment" (primitive form
of what came to be known as IDE) drive, while a single 50-pin ribbon cable
would indicate that the drive is a SCSI.
The 20MB make me suspect that it's either MFM (if two cables) or a real old
ATA (IDE).
Get back to us with the answers.
Also, try to find the manufacturers model number on the 20MB drive (Not
IBM's part number, the original manufacturer's.)
Dave
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