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VulcanSphere (talk | contribs) Adding local short description: "Partition used by GNU GRUB on BIOS to boot an operating system with GUID Partition Table", overriding Wikidata description "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 GUID Partition Table" (Shortdesc helper) |
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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). 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<!-- MBR with disk timestamp, disk signature, AAP and NEWLDR support --> to 446<!-- classic MBR without any extensions --> bytes of space, thus they need an ancillary storage space. 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". 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.
The [[globally unique identifier]] (GUID) for the BIOS boot partition in the GPT scheme is {{samp|21686148-6449-6E6F-744E-656564454649<sub>16</sub>}}<ref>{{cite web
| url = https://www.gnu.org/software/grub/manual/html_node/BIOS-installation.html
| title = GNU GRUB Installation, Section 3.4: BIOS installation
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