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I am from Germany (Munich) and new in the forum. I have some strongly copy-protected programs (e.g. VisiOn from VisiCorp.). All are on 5.25" Double Density floppy disks. Can one copy such floppy disks better with 48tpi or with 96tpi drives? If Double-Density floppy disks with 96tpi drives are copied, are the tracks written in the correct width?

I'm sorry, if my English should be bad. https://www.cbmstuff.com/forum/images/smilies/angry.gif
What format disks are these? If they are 5.25" 1.2MB disks, then you MUST use a 96 TPI drive. If these are Atari 400/800, TRS-80, CP/M, and most Apple II and C64 disks, you can use a 48 TPI drive. A 96 TPI drive will work in all cases though, so it is much more versatile.
(06-22-2014, 02:42 PM)admin Wrote: [ -> ]What format disks are these?  If they are 5.25" 1.2MB disks, then you MUST use a 96 TPI drive.  If these are Atari 400/800, TRS-80, CP/M, and most Apple II and C64 disks, you can use a 48 TPI drive.  A 96 TPI drive will work in all cases though, so it is much more versatile.

I know this is an ancient thread, but it still shows up on a google search.  According to https://retrocmp.de/fdd/general/48tpi-vs-96tpi.htm you can run into issues when using a 96TPI drive to overwrite disks that have been previously written with a 48TPI drive -- when moved back to a 48TPI drive, the 48TPI drive can get confused.  So I think there are a few cases where 48TPI drives might be preferable, although degaussing disks before writing can probably take care of the issue.
I have never seen an issue using disks formatted on a 48tpi drive with a 96tpi drive (and vice-versa).