DragonFly BSD
DragonFly bugs List (threaded) for 2004-07
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Re: HD not correctly recognized

From: "Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>
Date: Thu, 15 Jul 2004 00:36:40 +0200

On 14.07.2004, at 21:32, Matthew Dillon wrote:
:You are right, it was the jumper. I had lent the drive for some time and
:just got it back, I forgot to check that point. It's ok now. My fault,
:sorry for that. Anyway, I still wonder why FreeBSD 5 and Linux didn't care
:about that jumper.
That's a good question. I have no idea, I'm assuming its some sort
of ATA command to override the jumper. But I'm not going to worry
about it for the moment.

This is a special interface which is supported by most modern hard disks. It makes the hard disk initialy report a smaller size so that old broken BIOS check routines don't hang (like old Award ones). If you tell the hard disk to show it's real ego, it probes OK. Some time ago I had to modify the freebsd MBR to get it booting on such a disk/BIOS combination. It's rather easy and should at least be supported by the first program of DragonFly that accesses the disk (loader/kernel).


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