Windows 8 doesn't boot. It BSODs (or rather GSODs -- gray screen of death) right after the Windows logo disappears.

It's because of a Kernel Data Inpage Error, which, according to this source indicates that Windows 8 couldn't read from the pagefile.

I think it's a hardware issue, specifically pertaining to how hard disk information is read/written. It's not a IDE DMA issue -- I created a Windows 8 disk image that uses the READ/WRITE MULTIPLE command, and it still BSODs this way.

Multi-sector reads/writes to the disk image haven't been extensively tested. I think there's a subtle bug where cross-block writes don't work properly. The only operating system that uses them is OS/2 (which works fine).

It's possible that the BSOD is due to a cross-block bug. Windows XP had trouble booting in the Emscripten version because single sector reads at the end of the block were corrupting the next one. OS/2 sometimes has trouble booting on my Android phone because of multi-block reads.

More investigation is required.