Firstly, thanks to everyone for their input.
Long story short is that I've again tried various methods and
software, including WinImage which SleeperMan mentioned. I've got as
far as completing a format (1.72 and/or 1.68 M, with or without
errors) and WinXP sees and reports the disk having 1'745'048 bytes or
1.66 Meg. Copying a 1.5 Meg file to that disk is a no go. I'll just
go with Maureen and POKO on this one, and resign myself to the fact
that XP is a poor floppy disk handler ...... nevermind anything
larger than standard.
Cheers again
Jona.
So, i tried like you said:
First, i tried to copy adaware 6181 file with lenght of 1,694,720 bytes to
floppy i created other day to 1,72M and got error. Explorer said capacity of
1,66M, but gave me error at 3/4 copying. So, i formatted same floppy with
WinImage to 1,62M - format was success, copying of this file also went
perfect.
But, since first formatting showed 1,66M, i think formatting with 1,62M
still leaves a bit of space, it's just not enough for 1,72.
So i tried two other methods of formatting which WinImage allows: DMF (1024
cluster size) and DMF (2048 cluster size).
Results are:
formatting with 1,68M method gave capacity of 1.702.400 bytes (1,62 M)
1024 size gave capacity of 1.714.176 bytes (1,63 M - but here i've got
one unreadable sector, which is probably result of old floppy - i just
didn't buy new ones for ages, so i looked in my drawers...),
while 2048 size gave 1.716.224 bytes (1,63M - same single read error).
Note however that formatting with bigger cluster size leaves more wasted
space when copying several files to floppy and may cause more
incompatibility.
at the end i formatted my floppy to 1,68M again, copied same file to A: -
again perfect. occupied space was 1.694.720 bytes, free space was 7.680
bytes.
I hope this helps in any way.