🚀 go-pugleaf

In article <881004014748.973404@PCO-MULTICS.HBI.HONEYWELL.COM>, Friesen@PCO-MULTICS.HBI.HONEYWELL.COM writes:
> ...
> GFA Basic, and I decided to put in a routine to show you how much free
> disk space you have on a disk.  I ran the procedure and it said that I
> had 0K available, but only 622367 of the 720000+Bytes were used.  I used
> the show info.  option on the desktop and got the same results.  What
> does this mean?  Can it be corrected?

Maybe it's because you have many small files on your disk. Each file occupies
at least one cluster (1024 bytes), that is, one cluster, recorded in your
FAT map. Because TOS cannot pack partial used clusters together, the smallest
file one can create is 1024 bytes in length. But TOS will always give you the
real length of your file, so the remaining space will be hidden and couldn't be
used.

Another possibility is that you may open one of your files for append fre-
quently. As you know, on an extend, TOS always makes up a new cluster, even
if there's room in the last cluster of the existing file. So, in worst case,
if you make 720 appends of 1 byte records, the disk will be full and in the
directory, you'll find a file of 720 bytes, the disk info will schow you 0
bytes available.

So, the problem you have may be the difference between directory lookup
and FAT lookup feature of TOS, directory lookup counts up the file lengths
in bytes, FAT lookup (used by disk info) will show you the number of free
disk clusters (FAT entries), times disk clustersize (*1024).

If your problem is about appending, you may copy your files to another disk
and then re-copy it to a virgin disk again. This will fix this problem for
awhile, but you'll do this then again. If your problem is about many small 
files, you should decrease the media cluster size of your floppy during
formatting (maybe 512 bytes).

Hope, this helps you.

--

alderaan
OP RKOpdp (RSTS/E)
FB Mathematik/Informatik
RKO Berlin

Dieffenbachstrasze 60-61
1000 Berlin 61

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