On Fri, 25 Nov 2022 12:12:36 -0800, Leonard D Woren <[email protected]> 
wrote:
>
>I've long wondered why.  And in the 1980s (I think), IBM actually had 
>a disk for s370 which was FBA, but only supported by DOS/VS.
>

3310 and 3370.  Also supported by VM/SP.  (Certain models of 3370 could also 
attach to System/38)

3375 was the CKD flavor of 3370.

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