> this makes me think that grub is causing the SATA controller to reset > itself with every disk read or something, and then grub is waiting for > it to come back to life before carrying on. On i386-pc GRUB uses BIOS calls to access disks. I'd suggest updating Option ROM and/or BIOS. I take no responsibility if your update fails in any way or results in bricked system. You can also try using --disk-module=native.
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