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Re: lseek() fails to seek on /dev/fd0 ('\\.\A:')
- To: "Corinna Vinschen" <cygwin-patches at cygwin dot com>
- Subject: Re: lseek() fails to seek on /dev/fd0 ('\\.\A:')
- From: "matt" <matt at use dot net>
- Date: Mon, 26 Feb 2001 16:27:10 -0800
- References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3A9A621F.7661F240@yahoo.com> <20010226161735.P27406@cygbert.vinschen.de> <email@example.com> <20010227004550.X27406@cygbert.vinschen.de>
> On Mon, Feb 26, 2001 at 10:10:15PM +0300, Egor Duda wrote:
> > CV> Indeed. I would be interested in the trivial patch as well.
> > well, almost trivial ;-)
> > It's not fully compatible with linux, as it doesn't allow seeking past
> > the end of media (i think this is ok), and, alas, for NT only :( (i
> > don't think this is ok, but i haven't found a way to get media size
> > under w9x)
> Did you try that even on raw partitions (\\.\X:)? From the MSDN:
> "The IOCTL_DISK_GET_DRIVE_GEOMETRY control code retrieves information
> about the physical disk's geometry"
> so I assume it will only work for raw harddisks (\\.\physicaldriveN).
If memory serves, a reason why dual-booting between win9x, NT, Linux, etc is
difficult is because early versions of win95 don't properly interpret what the
BIOS tells them about drive geometry and massage/use the information in a
somewhat unpredictable way. I remember this being discussed (by intelligent
people) on the Linux Kernel Mailing List recently -- let me see if I can find
the message and I'll reply with a link.
I would suggest testing this ioctl quite a bit across win9x variants before
implementing, or only supporting it on win98/ME.