[Info-vax] INIT/HIGHWATER

[Jose Baars]

On 7 feb, 20:02, moro... at world.std.spaamtrap.com (Michael Moroney)
wrote:
> Highwater usually stays out of the way, most applications have no need
> to try to read beyond the logical end of data and thus the highwater,
> but when one does the read is intercepted to return "read" data of
> all zeroes.
>

Making a zipfile with the "-V" option, and then trying to read it on
Windows
will reveal such disk data under some circumstances ( cluster size,
bad (ASCII FTP) transfers, never cared to precisely define them all)
when this zipfile has been made on a non-HIGHWATER marked disk.

Quite embarrassing to get a question what this COBOL code is doing
in a zipfile. I'm not sure if this is still the case with more modern
versions
of zip.

For such a situation, highwater marking on disk is useful.