No equivalent unused space exists on GPT disks, and the BIOS boot partition is a way to officially allocate such space for use by the boot loader. On MBR disks, such boot loaders typically use the sectors immediately following the MBR for this storage that space is usually known as the «MBR gap». Use of this partition is not the only way BIOS-based boot can be performed while using GPT-partitioned hard drives however, complex boot loaders such as GRUB 2 cannot fit entirely within the confines of the MBR’s 398 to 446 bytes of space, thus they need an ancillary storage space.
Create boot disk ipartition code#
When used, the BIOS boot partition contains the second stage of the boot loader program, such as the GRUB 2 the first stage is the code that is contained within the Master Boot Record (MBR). On MBR-partitioned disks, boot loaders are usually implemented so the portion of their code stored within the MBR, which cannot hold more than 512 bytes, operates as a first stage that serves primarily to load a more sophisticated second stage, which is, for example, capable of reading and loading an operating system kernel from a file system. On GPT-based devices, the sectors hold the actual partition table, necessitating the use of an extra partition. On traditional MBR-partitioned devices, the disk sectors immediately following the first are usually unused, as the partitioning scheme does not designate them for any special purpose and partitioning tools avoid them for alignment purposes. The BIOS boot partition is a partition on a data storage device that GNU GRUB uses on legacy BIOS-based personal computers in order to boot an operating system, when the actual boot device contains a GU >Ī BIOS boot partition is needed on GPT-partitioned storage devices to hold the second stages of GRUB.
0 kommentar(er)
