Can anyone shed some light on the feature of erasing data on DASD? I
am just curious thats all.
For instance does it erase one track at a time or a range of tracks
(or ?), once the command has been issued
does it tie up the channel until the command ends ? (or is it
asynchronous?) Is there a transfer of data for each track (or cyl or
block?)
Is the erase just internal to the device (or control unit) so the cpu
is not bothered until the erase is complete or ?
Along similar lines on the STK (IBM or HDS) after a "track" has been
erased does the de-stage of the erased data take place reasonably
soon or does the device automagically take care of the erased data? I
hope I am not asking for privileged info, just general information to
better understand thats all.
BTW there was an item in an IBM pub that at first attempted (IMO) to
come across as an article of fact finding as it turned out it was an
ad for FDR erase product. It was cleverly disguised, IMO but after
reading about the page after page of platitudes it was, come to find
out, an ad from the FDR people.
Ed
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