Re: Harddisk size and P4PE
- From: nospam@xxxxxxxxxx (Paul)
- Date: Sun, 02 Jul 2006 07:53:10 -0400
In article <kIMpg.2945$YI3.519@amstwist00>, Lars-Erik Østerud <.@.> wrote:
Today I have an 80 GB S-ATA disk on my P4PE mainboard.
Is there any limit to what BIOS or XP will handle on P4PE.
Wondering about buying a 160 GB next time. Will that work?
In your case, I would not predict a problem. That is because
the driver used in your case, will be using SCSI emulation,
and the OS does not use any IDE code to reach the disk. The
only limitations would be set by the Promise hardware itself,
or I suppose the SCSI control block passed to the Promise
driver, has some limited number of sector address bits. The
casual evidence I've seen, implies this number must be greater
than 32 bits, which means I would feel comfortable myself,
trying a SATA drive up to at least 2.2TB capacity.
To answer this question for _any_ hardware combinations, would
take several pages of text.
Generally speaking, Southbridge hosted storage, has more test
cases, than a separate RAID controller does. There are at least
three software cases for a Southbridge, so it requires more
careful consideration than a separate RAID controller. Southbridges
can use native drivers, in I/O space or PCI space, or can use
SCSI emulation RAID drivers, and the answer gets messy. The native
drivers are the ones that expose the 137GB limit, and make it
more visible to the user. When the IDE protocol stack is used
for a drive, then the OS support, hardware support, and BIOS
support, all have to be present for it to boot and work properly.
http://www.t10.org/t13/technical/e00101r6.pdf (how 48 bit works on IDE)
http://www.48bitlba.com/overview.htm (applies to IDE drives)
http://www.48bitlba.com/faq.htm (don't buy a BIOS from them!)
The first paragraph of install type (2) applies to you (pg.10).
With SATA via SCSI emulation, I would not expect a problem.
http://www.seagate.com/support/kb/disc/tp/137gb.pdf
Paul
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