Re: Need P4C800-E BIOS settings to enable 48-bit LBA with Windows 2000
- From: Paul <nospam@xxxxxxxxxx>
- Date: Mon, 10 Dec 2007 01:23:36 -0500
zeke7 wrote:
Thanks Paul. My concern is that the MS Knowledgebase article on "48-
Bit LBA Support for ATAPI Disk Drives" is quite explicit that the
motherboard have "a 48-bit LBA compatible BIOS" in order for their
regedt patch to work correctly on partitions >137gb. And an earlier
post here (~2003) had someone going through these same BIOS settings
with a related but not identical problem.
(I misquoted the MS-KB XP version above; the Win2K version is kb/
305098.)
Experienced a number of disasters regarding this issue, and want to
make sure I get things correct this time.
Do you have any advice on the 32-bit data transfer setting? Bios
defaulted to Disabled, my intuition is that it should be Enabled.
I'll check out that HDTune program.
The "32 bit transfer mode" is discussed here. It is used in PIO transfer
mode (a mode you would hope is not normally used). It saves two 16 bit
cable transfers, to be transferred by the processor as one PCI bus 32 bit
transfer. Apparently, there are some conditions under which there is a
lack of compatibility, but I've forgotten the details. That is
probably why the default is disabled.
http://www.storagereview.com/guide2000/ref/hdd/if/ide/modesAcc32Bit.html
In terms of verifying that the thing is ready, you can use HDTune,
or you can use a blank drive larger than 137GB for testing. Use a
disk which does not contain any valuable information. Connect it
to the P4C800-E Deluxe. Create a partition which spans the 137GB
mark. Copy files to it, until the file system is filled to at least
a bit more than the 137GB mark. If the file system survives being filled
to that level, it means you've passed the point where a 28 bit attempt
to write, would have rolled over and killed the part of the disk around
sector zero.
In other words, if you have to test, and are concerned about connecting
a live drive to the system, try testing with an empty disk first. If the
empty disk passes all your test cases, then you can connect the disk
which is filled with files, with more confidence.
Spare drives aren't that expensive, and are cheaper than losing a lot
of data. If in doubt, test first.
Paul
.
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