UTC Time: June 10, 2017 8:19 AMFrom: pascal@plouf.fr.eu.orgLe 10/06/2017 à 10:07, Fungi4All a écrit :> From: scdbackup@gmx.net>> To boot from hard disk or USB stick, there must be a Master Boot Record.>> In linux alone the MBR is unnecessary and boot info can be stored in> each partition and be handled by grub or lilo. Correct?Not correct. A MBR is necessary for either BIOS or UEFI boot from thiskind of device.
GPT drives tend to include a “protective MBR.” This type of MBR says that the GPT drive has a single partition that extends across the entire drive. If you try to manage a GPT disk with an old tool that can only read MBRs, it will see a single partition that extends across the entire drive. This protective MBR ensures the old tools won’t mistake the GPT drive for an unpartitioned drive and overwrite its GPT data with a new MBR. In other words, the protective MBR protects the GPT data from being overwritten.
Windows can only boot from GPT on UEFI-based computers running 64-bit versions of Windows 10, 8, 7, Vista, and corresponding server versions. All versions of Windows 10, 8, 7, and Vista can read GPT drives and use them for data—they just can’t boot from them without UEFI.