08-12-2015, 04:24 PM
(08-12-2015, 03:13 PM)admin Wrote: There is a thread here about copying 8" disks, and some people have done so without any problems. However, this can only be done using soft-sectored disks (single index hole). Hard sectored disks can not be duplicated with current software because it expected 1 hole = 1 revolution.
You will have to use the C64 setting with 48 TPI selected.
I've only found two threads:
https://www.cbmstuff.com/forum/showthread.php?tid=211 is related to reading of 8" disks only.
https://www.cbmstuff.com/forum/showthread.php?tid=83 starts off talking about duplicating 8" disks but then diverges into reading 5.25" disks for a Heathkit using a 5.25" 1.2mb drive and never answers the original question, unless I'm missing something.
Is there another thread I'm missing?
The disks in question are soft-sectored and are not in an exotic format (double-density MFM, 256 bytes/trac, 26 sectors / track -- a standard IBM 8" format used by many many computers). They can be read/written pretty trivially using a standard PC FDC and ImageDisk.
I'm not sure I understand your suggestion for using the C64 / 48TPI setting -- 8" drives have 77 tracks, the C64 only has 38. I'm not having any trouble reading the disks at all, but writing them back is problematic. What settings does the C64 setting affect that would improve this?
I can send some sample disk images your way if that would help.
Thanks,
Josh