Subject: Re: Large Disks / Clean Install
To: Paul Wain <paul.wain@nc.com>
From: Manuel Bouyer <bouyer@antioche.lip6.fr>
List: current-users
Date: 01/29/1999 11:10:58
On Jan 28, Paul Wain wrote
>
> wd0 at wdc0 channel 0 drive 0: <Maxtor 91728D8>
> wd0: drive supports 16-sector pio transfers, lba addressing
> wd0: 16479MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 33750864
> sectors
> wd0: 32-bits data port
> wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2
> 
> Now look at that carefully. 16.5 Gb disk, sounds fine. However
> 16383*16*63*512 => ~8.2Gb disk! Where has all the rest gone. Looked on
> the drive case. 16383*16*63. So the drive probed co

Known brockennes of the current i386 BIOS: it's limited to 16383 * 16 * 63
(which means you can't boot from a partition after the 8G limit).
The current ATA draft specifies that disk bigger than 8G shoun'nt report
a CHS bigger than this, to not confuse the BIOS.

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
--