#HOW DELETED IS DELETED?
19-Feb-92 13:06:56
Sb: #33582-#HOW DELETED IS DELETED?
Fm: Mark Burns [Network TM] 70751,3565
To: Dan Crimmins 70674,1500
Dan,
I'll send those nice men with the white coats over to see ya…<grin>
They'll even have a new jacket for ya to wear…but you might have some
diffuculty typing after putting it on.
ACAD itself doesn't do anything to deleted a file, the entries in the
standard ACAD.PGP file and the FILES utility menu all just do basic dos
DELETE oprtations – nothing more fancy than that. The reason that your files
may not have been UNERASEable is that ACAD will continue to open new
temporary files while you are continuing to wotk in the drawing editor. When
a new temo file (or even the new version of the curent file created by a
SAVE or END command) can simply grab the directory entry slot the USED to
have been the home of your deleted file's directory entry. As soon as DOS
deletes a file, the only thing it does is to mark the directory entry as
deleted. Any subsequent file creation calls (by ACAD or any other program,
for that matter) will look for the first, sequential, open directory slot
(including any deleted file slots) in the directory list. It will then use
this directory slot for itself, permanently erasing the deleted file's
directory entry. This is probably what happened to you.
Better luck next time!<grin>
Regards,
Mark Burns – [Network TM]