Martins wrote:
Um, if you do this, you will more than likely destroy the filesystems
as well, because the new partitions will not line up exactly with the
old ones.
Anyway I don't think this is the problem. Afterall, WinXP booted
fine before on this drive with LBA disabled, so something else is
up. If you already made the right changes to the boot.ini file, then
I suspect that a "fixboot" from the recovery mode of the WinXP CD
will be necessary.
This should not overwrite the MBR, only the boot loader that is at
the beginning of the windows partition.
-Richard
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gentoo-user@gentoo.org mailing list
there is no worry, writing new partition table give it the same values
(partition start, end, type, order) as before and not a single bit is
lost
What I am saying is that this is not possible with fdisk, because fdisk
will insist on creating the new partitions aligned on cylinder
boundaries, which will have moved in terms of logical sectors. Example:
Let's say you want a 100MB partition, or about 200000 512-byte sectors:
With non-LBA geometry, the math is 200000 sectors / (63 sectors/track *
16 heads) = 198.41 cylinders. Now round down to 198 cylinders and you
get 199584 sectors in your partition
With LBA geometry, the math is 200000 / (63 sectors/track * 255 heads) =
12.449 cylinders. Again, round down to 12, and you get 192780 sectors
in your partition. You can round up to 13 and get 208845, but you
*cannot* get 199584. Possibly with another partitioning tool that
allows you to specify the starting and ending heads as well as
cylinders, but not with fdisk.
It is *possible* for this to work if you have just one huge partition,
or if your partitions happen to end at even multiples of both (63 * 255)
and (63 * 16).
And just for the sake of accuracy, the cylinder alignment thing is true
for all partitions except:
- Cylinder 0, head 0 is reserved for the MBR, so any partition starting
at cylinder 0 actually starts at head 1.
- Logical partitions actually start at head 0, sector 1, because the
first sector contains another partition table that points to the next
partition.
-Richard
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gentoo-user@gentoo.org mailing list
