[Coco] Read Coco floppies in my PC
aawolfe at gmail.com
Sat Mar 31 00:02:22 EDT 2012
Your results are atypical.
The problems between 1.2mb drives and 360k drives are very well known.
This used to be common knowledge, but I guess its been a good long
time since anything regarding floppy disks was well known.
For instance, this microsoft article details the problem:
You will find further documentation in the wikipedia article on floppy disks:
The crux of the issue is that 1.2MB FDD use a narrower track than 360k
disks by design. The read head on a 1.2MB FDD can easily read the
wide tracks written by a 360k drive, and it can also read the narrower
tracks written by 1.2MB drives. However, 360k drives cannot usually
read the narrow tracks written by a 1.2MB drive. This means writing
to a 360k disk with a 1.2MB drive generally renders the disk
unreadable by 360k drives. This is a physical property of the write
head and not something changeable via software.
On Fri, Mar 30, 2012 at 11:53 PM, Chad H <chadbh74 at hotmail.com> wrote:
> I have 9 360k pc-xt drives, all fully tested to read/write disks formatted by 1.2 mb drives without problems....?????
> Michael Graham <mkgraham at gmx.com> wrote:
>>Just FYI, most double-density (360k) drives won't read double-density
>>disks written on high-density (1.2M) drives. I tried this when I first
>>got my PCjr, and it didn't work, so I had to swap the 360k drive back
>>and forth between my PCjr and my old desktop machine until I could
>>source another 360k drive. I couldn't get disks written in a 1.2M drive
>>to read on my CoCo, either. However, disks written with a 360k drive
>>will read back just fine on a 1.2M drive, as long as you don't try to
>>write to them.
>>On 3/30/2012 8:20 PM, Bill wrote:
>>> The drives I just got are 1.2Mb, and I have tried several times to format a
>>> 360K disk, but for some reason it won't let me. I type in the command format
>>> b: /f:360 (which SHOULD work), but it gives me an error message.
>>> Has ANYONE been successful formatting a 360K disk in XP with a 1.2Mb drive?
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>Coco mailing list
>>Coco at maltedmedia.com
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