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  1. I'm trying to install WinXP x64 SP2 as part of a large multiboot disk project. The various XP32 installs are fine, but the x64 installs fail with the classic 0x7B error (Inaccessible boot device, IIRC). I've never seen this in text mode though, but I've read this is because it is losing access to the disc volume. Now, I'm attempting to install this initially via the USB multiboot, which is a basic Grub4DOS mem mapping of the ISO into RAM, but whilst this works great for x86, it fails for x64. To try and narrow down the problem I burnt the ISO to a physical disc, and booted it using a USB3-connected external Bluray drive. This too fails with error 0x7B at the same point. Now, my suspicion is that both Grub and my BIOS's emulation of a drive both in RAM and over USB is being wiped out by the x64 kernel firing up. It's fine in 32-bit mode (probably due to all the compatibility layers), but x64 doesn't have all that "baggage" so probably assumes it has Carte Blanche to do whatever it likes... Does this sound plausible? I'm going to have to try removing the drive from its caddy and hooking it up directly via SATA and see if that works, which should confirm my suspicions...and also trying a clean XP64 ISO, though given where its failing I don't think the multiboot layout is the issue at all as short of a couple of lines in txtsetup.sif and a scattering of files it's all clean already...
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