Date: Thu, 30 Sep 1999 01:46:41 +0200 (CEST) From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de> To: freebsd-hackers@FreeBSD.ORG Subject: Re: 2.88Mb floppies Message-ID: <199909292346.BAA03499@dorifer.heim3.tu-clausthal.de>
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Wilko Bulte wrote in list.freebsd-hackers:
> As Doug Rabson wrote ...
> > On Mon, 27 Sep 1999, Wilko Bulte wrote:
> > > static struct fd_type fd_types[NUMTYPES] =
> > > {
> > > { 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
> > > { 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
> > > { 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
> >
> > I have no idea whether that driver can cope with 2.88mb floppies to be
> > honest. There is only one way to find out...
>
> Right. I'll give it a try asap. Somebody sent me a sample entry to
> add to fd_type. But I want to do a bit of study on the fd source to see
> if I can understand what all the fields mean.
I once programmed low-level FDC stuff under DOS, so I'm a bit
familiar with this... The difference between 1.44 and 2.88 Mb
floppies is that the latter use 36 sectors per track and twice
the data rate (1 MBit/s). So the entry should look like this:
{36, 2, 0xff, 0x1b, 80, 5760, 1, FDC_125KBPS, 2, 0x6c, 1}
Actually, there should be a #define FDC_1MBPS FDC_125KBPS
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
(Terry Pratchett)
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