*BSD News Article 79948


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From: Ken Bigelow <kbigelow@www.play-hookey.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Dos Partition Mount
Date: Sat, 05 Oct 1996 07:20:16 +0000
Organization: Erol's Internet Services
Lines: 33
Message-ID: <32560C30.3E12@www.play-hookey.com>
References: <01bba9f8$8c05e240$b0675ac2@defau> <52qq1q$1a2@anorak.coverform.lan> <531n1i$fc@prds-grn.demon.co.uk>
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Thomas D.G. Sandford wrote:
> 
> Brian Somers (brian@anorak.coverform.lan) wrote:
> : In article <52pium$14h@newsbr.eunet.fr>,
> :       fgm@osinet.fr (Frederic G. MARAND) writes:
> : > Vlad D. Nebolsin <nebo@glas.apc.org> wrote:
> : >>Resume: DON'T MOUNT >400Mb DOS PARTITIONS or you will nuts with deadful
> : >>    system.
> : > Actually, ithe limit is not 400 Mb, but around 500 MB (I guess it is
> : > 528 MB, but someone had better confirm/infirm). It has to do with the
> : > bios boot code. More details were given (must have been last year) in
> : > Unix Reviiew.
> 
> : It's >= 512 Mb ;O
> 
> I believe it is ~1GB - I have a 2GB drive partitioned not quite equally.
> The (slightly) smaller partition mounts fine, mounting the larger is a recipe
> for total disaster. Fortunately I bought a DAT drive with the same order...
> 

1024 cyls * 16 heads * 63 sectors = 1,032,192 sectors = 516,096K = 504MB

if you do it in binary mode. The actual requirement is that the ROM BIOS
must be able to locate and load the kernel; it can then load everything
else from the whole drive. If your, BIOS, like so many, has the above
limits on direct access to the hard drive, the whole kernel must reside
below that limit.
-- 
Ken

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