IBM CMS dumpfile idiocy

Dave Wade dave.g4ugm at
Tue Dec 15 09:37:54 CST 2015

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of Chuck
> Guzis
> Sent: 15 December 2015 06:21
> To: CCtalk <cctalk at>
> Subject: IBM CMS dumpfile idiocy
> Just finished reading a 9 track tape made with IBM CMS in its dumpfile
> format.
> Why on earth--or might I say, what idiot--designed this format?  First the file
> data in a series of records, *then* the file name and other metadata.
> Anyone know of a DOS/Windows/Unix utility to unravel one of these things?
> I don't feel too much like coding for a single tape.
> --Chuck

The files are in the same format as on disk. The system just copies them back to disk. What size are the blocks as I have a "C" utility that will read the older smaller block size files.
You can always download Hercules and VM/370 ....


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