* IDE drives mis-reporting size... bug or feature?
@ 2001-06-20 18:00 Josh Fryman
2001-06-20 18:34 ` Guest section DW
0 siblings, 1 reply; 2+ messages in thread
From: Josh Fryman @ 2001-06-20 18:00 UTC (permalink / raw)
To: linux-kernel
hi all,
this is an odd one. i think it's technically a feature
but might be perceived instead as a "bug". anyway, i've
got a pair of Ultra100 Maxtor 52049h4 20GB drives, on a
Promise Ultra 100 (PDC20267) controller.
the drives were popped in with the jumper on for the
4096 cylinder limit forced. (it's a long story as to why.)
the other jumpers were set normally for master/slave config.
the promise controller recognizes the drives on boot-up
init as being what they are - ~20GB - and continues on
merrily.
Windows 2000 recognizes the drives as ~2GB in size, due to
the jumper. it's observing the 4096cyl limit on the drive
in some way. (remove the jumper and it sees ~20GB too.)
Linux 2.4.3 recognizes the drives as ~20GB regardless of
the jumper.
so, is this a bug or feature? is windows or linux not
working right here? what *should* be seen with the drive
jumpered such?
cheers,
josh
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: IDE drives mis-reporting size... bug or feature?
2001-06-20 18:00 IDE drives mis-reporting size... bug or feature? Josh Fryman
@ 2001-06-20 18:34 ` Guest section DW
0 siblings, 0 replies; 2+ messages in thread
From: Guest section DW @ 2001-06-20 18:34 UTC (permalink / raw)
To: Josh Fryman, linux-kernel
On Wed, Jun 20, 2001 at 02:00:44PM -0400, Josh Fryman wrote:
> this is an odd one. i think it's technically a feature
> but might be perceived instead as a "bug". anyway, i've
> got a pair of Ultra100 Maxtor 52049h4 20GB drives, on a
> Promise Ultra 100 (PDC20267) controller.
>
> the drives were popped in with the jumper on for the
> 4096 cylinder limit forced.
>
> the promise controller recognizes the drives on boot-up
> init as being what they are - ~20GB - and continues on
> merrily.
>
> Windows 2000 recognizes the drives as ~2GB in size, due to
> the jumper. it's observing the 4096cyl limit on the drive
> in some way. (remove the jumper and it sees ~20GB too.)
>
> Linux 2.4.3 recognizes the drives as ~20GB regardless of
> the jumper.
>
> so, is this a bug or feature? is windows or linux not
> working right here? what *should* be seen with the drive
> jumpered such?
The jumper is to overcome a BIOS defect.
The operating system should see the true size.
In order to get Windows to see the true size you may need MaxBlast
or similar boot manager stuff.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2001-06-20 18:00 IDE drives mis-reporting size... bug or feature? Josh Fryman
2001-06-20 18:34 ` Guest section DW
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