Do you mean there is some way to use it on a Disk ][ card ...or that it is is a disk ][ with a DB19 connector?

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There is an adapter to go from the 20-pin header to DB19 out there like this:



But half of the Disk II controllers had the DB19 connector on them; i.e.



vs.

Assuming the latter; treat it like a Unidisk 5.25 / Apple 5.25 Drive?

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Yes. For further reference, see this page:

http://www.vintagemacworld.com/drives.html