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Re: Hardware musings
"Andy McFadden" <fadden@fadden.com> wrote in message
news:453d64d0$0$34499$742ec2ed@news.sonic.net...
> Charlie <charlieDOTd@vereyezon.net> wrote:
>>> I wonder why that is... maybe the index hole, the pc drive relies on the
>>> index to pass?
>>
>> Yes at least it needs the index pulse with Disk2FDI although I don't know
>> if
>> it is really used to do anything other than get the process started.
>> Disk2FDI uses some pretty interesting tricks to get an MFM drive to read
>> GCR
>> disks.
>
> The signal from the index hole is one of the streams recorded in the .FDI.
>
> I haven't looked at the code in a while, but I believe it's used to find
> the start and length of the track.
>
Okay, thanks Andy, that does make sense.
Charlie