tried to test on my dual-p3 board with a pci-atapi Adapter.
Reactos Setup sees the disk and all partitions but stops at the Partition Format Progress bar. HD-Led is lit but nothing happens, not one file copied.
After restart Windows reports the Partition as not formatted.
I retried it after i have pre-formatted the Partition and Chose to use current filesystem. Then the Setup hangs at the file copy Progress bar.