Starting your Surface from a USB drive can be useful if you want to change firmware settings or Windows startup settings or if your Surface device does not turn on, start, boot, or wake from sleep.

The boot drive is the most fundamental of all the drives your PC may use, as it contains the operating system. Whether it's a hard disk drive (HDD) or solid-state drive (SSD), it has everything your ...

If there are multiple drives installed in the computer, then it can create confusion as to which drive has a Bootloader. This scenario usually happens when Master Boot Record is on the wrong drive.