🚀 go-pugleaf

[ munch, munch ... ]

I was hit by a rather obscure bug in TOS, Below is an exact description
of what happened.  Does anybody else happen to stumble upon the same
problem?
--------
SYSTEM
    Atari 1040 ST. TOS in ROM (of course). One DS drive.
    Only operating system and basic accesories loaded.  No RAM-drive
    at the moment.
ACCESORIES  (which you need to reproduce events)
    A disk which sometimes in a past was initialized as two-sided.
    Currently re-initialized as a single sided and completely filled
    with files.
SITUATION
    At the Desktop, by a mistake I tried to copy one more file to
    the disk.  Without RAM-drive I used "copy a: to b: and swap, swap,
    swap..." method.
RESULTS
    Operating system happily went throgh motions.  No error reported
    during the whole operation.  First indication that something went
    amiss was that a directory listing looked exactly as before the
    operation.  As it turned out some parts of a file which I tried 
    to copy - a program file - were deposited on the disk overwriting
    an end of one file and a begin of the next one.  Apparently some
    pointers in FAT for the second file were changed making the last
    sector of the second file its begin - at least in some circumstances.
HOW TO AVOID
    I don't know.  Be careful and tip-toe around.
-----
Michal Jaegeramnn
Myrias Research Corporation
Edmonton, Alberta, CANADA