Have recent H8-1420t i7 "ENVY" desktop. Once I got v. 13.04-64 running on a second installed HD, I ran into a new problem I've never seen before.
Evidently, at least in this machine, if you have any other bootable HDs connected to no matter what order of mobo SATA sockets, Win 8 will try to start and fail giving a "Preparing Automatic Repair" message. This is effectively the new BSOD message! Win 8 will not tolerate any other bootable HDs in the machine.
If I have only my Ubuntu drive plugged, then that's what boots in Legacy boot mode. If I have only the Win 8 HD plugged, then it boots fine in Legacy mode. But if I have both drives plugged and simply turn the machine on, then the failure above happens no matter how the drives are plugged in the SATA sockets. This really startled me at first. Windows 8 locks down the machine.
To get a dual-boot machine then, I leave both drives plugged and simply tell the F10 BIOS that the Ubuntu drive is "hidden" in order to successfully boot Win 8, or else I can unhide the W8 drive and start the Ubuntu HD with the F9 boot menu to get Linux. That way I can see the W8 file system in Ubuntu. Whew!
I don't see any neater workaround for this incredible new problem.
It makes me very unhappy that Windows 8 behaves this way. I'm afraid to install Ubuntu on my W8 Lenovo G780 laptop which only has 1 HD. I worry about having to spend a lot of time getting the machine to run again. It's safer when there are separate HDs.
No wonder the Hispalinux group in Spain has petitioned the EU re: MS monopoly.