Joel Ewing wrote:
Every MVS volume I have seen in the last two decades is on an emulated
3390 drive, ...

Me too - until just a few days ago when I happened upon a number of 3380's defined at a client site. All I can guess is these were still real 3380's at the time they needed to be moved to a DS8000. TASID shows them as 3380-TC3 (whatever that is) at 3,339 cyls. I think I remember a type 3380-K (triple density?), but much of those years is just a blur to me.

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