I'm running Windows 2000 Server SP4 under QEMU, created a disk image for it. Windows 2000 was already installed on /dev/hdc, and I needed to give it more space, so I created it with qemu-img. The new image is in the qcow format.
Under Windows 2000, I start up Logical Disk Manager (Control Panel->Administrative Tools->Computer Management->Disk Management). It properly writes its signature to the disk just fine. However, once it's done that, and the disk is clicked, QEMU just exits with the following: