On 6/4/21 3:02 PM, Lyle Bickley wrote:
There is NO WAY that "dd" can handle the 5.25" hard sector format FDDs. First
of all, the HP 4145A sector sizes vary from one part of the diskette to
another. Secondly, this is a hard sector diskette. So one needs to have a FDD
drive that supports a "hole" for every sector. Very few do.
KyroFlux "may" work with a hard sector FDD - but I haven't tried it. (KyroFlux
reads diskettes flux patterns as analog and saves the results in a file. One
then post-processes the analog to re-create/analyze/digitize same. Some
Computer Museums and some of we hobby folks use this methodology to copy
"weird" formatted disks. Caveat: The program to re-create/copy the analog is
specific to the media being used and I'm not aware of one for hard sector 5.25"
diskettes.)
I just went into the other room and checked again, just to be sure.
The boot disk in my 4145A, which is an HP-labeled original 4145A boot
disk, which actually boots, has ONE sector hole, therefore it is
soft-sectored.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire