To do this open a Terminal session and type in lsblk and look for the USB device. Creating a GRUB2 USBįirst we need to identify the USB memory stick that we want to install Grub on. I would also suggest either removing or disabling in UEFI all the storage devices that are currently using grub as a bootloader. I pointed it to a USB drive that was free of checksum errors but. When doing this I suggest using a Linux Live-CD to install grub onto the memory stick (I used Ubuntu 14.04.2 Desktop), while it will work on an installed version of Linux, providing it is using the legacy boot mode and not UEFI, I wouldn't recommend it as it is possible that installing grub on the USB memory stick may break the version of grub that is currently in use. I booted up the FreeNAS installation media, and selected the Install/Upgrade option. We are basically using grub on the memory stick as a catalyst to access grub on the FreeNAS device which in turn will let us boot FreeNAS.
The workaround involves installing grub on to a bootable usb memory stick that is using the Master Boot Record partition table and add an entry for the FreeNAS boot device.
In this document I will explain how to implement a workaround that will allow the system to boot into FreeNAS. The ASUS AM1M-A has an issue with booting OSes in legacy mode that are using the GUID partition table, which is used by FreeNAS by default.
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