Format crashes

Not having done an install in a long time, I decided to test this again. I
setup a new VMware machine, attached a new 100 MB virtual harddisk to it and
booted from a newly created ReactOS.iso. It got as far as the "Format
partition" screen. There, an exception occurred with the following backtrace:

RtlCopyMemory()
IoDeviceControlCompletion() ntoskrnl/io/cleanup.c:57
IoSecondStageCompletion() ntoskrnl/io/cleanup.c:224
IofCompleteRequest() ntoskrnl/io/irp.c:320
IoCompleteRequest() ntoskrnl/io/irp.c:336
DiskClassDeviceControl() drivers/storage/disk/disk.c:1088
ScsiClassDeviceDispatch() drivers/storage/class2/class2.c:2350
IofCallDriver ntoskrnl/io/irp.c:145
IoCallDriver ntoskrnl/io/irp.c:158
NtDeviceIoControlFile ntoskrnl/io/ioctrl.c:117