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@greyknight33 are the 2 disks/partitions each separately encrypted? if not, yes, easily. if they are, it could still be spending cycles on the infected install when running to break the encryption of the other. is secure boot enabled? if not, pretty easily via the bootloader, if it is, possibly still via the bootloader but it'd be trickier. otherwise the BIOS is an option but that's very manufacturer specific, so it'd usually be a last resort vector.

in short, definitely possible. likely? no