mountroot> while booting r255342 memstick

[Uzumaki Naruto]

> If the issue is GPT and MBR, I am quite sure this laptop BIOS doesn't support GPT disk type, because OEM Acer only gave GPT supported BIOS for model that pre-loaded with Windows 8.

Maybe it helps to clarify, this laptop got no UEFI firmware, I could convert my hard disk to GPT type using diskpart command, but the functionality to boot from GPT partition is unavailable through BIOS.