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[Qemu-devel] Installing XP and Partition Sizes

From: Bernd Herd
Subject: [Qemu-devel] Installing XP and Partition Sizes
Date: Tue, 15 Feb 2005 11:17:20 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; de-AT; rv:1.7.5) Gecko/20050105 Debian/1.7.5-1


while converting my existing vmware machines to qemu I found that some boot and others don't. I've installed Windows XP using the current CVS branch of Qemu.

I found that the problem is caused by the fact, that qemu doesn't support all combinations of cylinmders, heads and sectors. My hypothesis is that a start partition ending beyond a cylinder number of 1023 can cause problems.

Using the informations retrieved from raw images using

 /sbin/fdisk imagename.raw

it seems that the maximum size of the booting partition is about 480 MByte. This is not sufficient to Install Windows XP.

I think that if any part of the Windows booting environment is beyond the first 480 MByte, then the system is unable to start.

My solution was to create a 2 GByte Image and create two partitions: a small one (to boot from) and a big one to hold the main part of Windows XP. This can be done within the windows XP installer. Using this approach XP installed without any problem (and can be rebooted...).

Using this approach I was also able to convert my Windows NT environments from vmware to qemu. I installed a small temporary NT environment into a 480 MB partition, copied the bigger system into the small partition with xcopy and used the copy with qemu. That way I was able to boot vmware machines that did not boot before.


        Bernd Herd


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