Follow-up Comment #1, bug #39216 (project grub): Hi, it looks like BIOS problem. Older BIOSes cannot handle such big devices (and GRUB depends on BIOS services). For example BIOS freezes on my machine before loading any bootloader if I connect 1TB USB hard drive. If You don't use this USB hard drive as booting device, You maybe can avoid this problem - try disable masstorage related USB part in BIOS, i.e. booting from USB devices or Legacy USB Support etc. BR, Ales
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