Ben A L Jemmett wrote:
  >>Huh?  This sounds like you are saying that the controller is specific to the
  >>drive.
 > Both of mine were...  one was a 20Mb drive, the other was
 > 32Mb.  Although the connectors were identical, they would
 > only work on the controller cards that came with them.  A
 > 15Mb Miniscribe drive wouldn't work with either controller
 > - so I assume the Seagate controllers were specific for
 > the drives.

The 21M drives are usually MFM, a similar drive formated
(if it's made for that) to RLL would be 32M.
  AFAIK, you can use an MFM controller with both types of
drives, but you can only use an RLL drive with an RLL
controller.
  IIRC, if you use an MFM controller you only get the 21M
but the RLL controller will only format it with the RLL
encoding. That is, 50% more.
  On the same type, I don't think that the card makes a
lot of difference except that the card will low level
format the drive in its own way. That means that if a card
doesn't work with a drive which is already formatted, then
all you have to do is low level format it again with the
new card.
  Perhaps someone more knowledeable can elaborate.

Cheers,
        Ole Juul

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