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From: "dom" <dcurran AT ti DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Can't read HDD sectors, why?
Date: Mon, 28 Jan 2002 12:53:07 -0600
Organization: Texas Instruments
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

How do i go about locking the volume ?

Your right I should have been reading sectors starting from 1, but even if I
changed this _bios_disk(..) still returned the same errors as before.

I also found that calling biosdisk(..) *did* work and I could read sectors.
I wonder if this perhaps does a lock on the volume for you, documentation
doesn't say, I guess I could download source code and look.

Anyway since I can read sectors now with biosdisk(..) I'm happy enough.

thanks
dom


Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote in message
news:Pine DOT SUN DOT 3 DOT 91 DOT 1020127113826 DOT 14549Q-100000 AT is...
>
> On Sat, 26 Jan 2002, dom wrote:
>
> > I want to read sectors from my HDD.
> > I am using the following code (which is almost identical to the help
code
> > for _bios_disk).
> >
> > If I run this code from a Win98 dosbox then it returns a status of 0x50
> > (Data read error && Seek error).
>
> IIRC, Windows 9X requires that you lock the volume before it allows
> direct access on the sector level.
>
> > If I run this code after booting to the dos prompt using a Win98 boot
disk
> > it returns a status of 0x01 (Invalid request or a bad command).
> >
> > Can anyone tell me why ?
>
> Here's why:
>
> >  di.sector   = 0;
>
> The first sector on a disk is number 1, not zero.
>
> > I thought that when booting to the DOS prompt using a Win98 boot disk, I
> > would be in a 16-bit enviroment.  Is this true ?
>
> I don't understand what do you mean by ``16-bit environment''.  DJGPP
> programs always run in 32-bit protected mode, even on plain DOS (the
> DJGPP startup code switches the CPU into protected mode).
>
> > Might this have something to do with it ?
>
> No.