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  A minor point re downloading from a dive computer (whether separate or built
into the breathing set): I recently met someone who often downloaded a dive
computer's records into his PC, and he asked me to sort out some problens with
his PC, including shortage of free hard disk space. In the course of me doing
this, CHKDSK /F found EIGHT MEGABYTES!! of `lost chains', of which many were
records of old dives. These occupy space while appearing neither as named
files on any directory nor as available free space. Likely his dive computer
-> PC downloader has the same bad habit as e.g. the WATFOR compiler has,
namely writing not to a proper file but to a loose chain of store blocks.
Finally the downloader connects this chain to a directory as a file; but if
the downloading is interrupted the loose chain remains as a lost chain,
confiscating yet more valuable hard disk space until suddenly there is none
left, until CHKDSK /F or a program called `Norton Disk Doctor' is needed to
get rid of them; but not all divers who use PC's as an incidental may know
these computer technicalities. So PLEASE could dive computer -> PC downloaders
create the directory entry FIRST and then write to a proper file.

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