Partition used by GNU GRUB on BIOS to boot an operating system with GUID Partition Table
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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 GUID Partition Table (GPT). Such a layout is sometimes referred to as BIOS/GPT boot.[1]
A BIOS boot partition is needed on GPT-partitioned storage devices to hold the second stages of GRUB. 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. On GPT-based devices, the sectors hold the actual partition table, necessitating the use of an extra partition. 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.
The BIOSbootpartition is a partition on a data storage device that GNU GRUB uses on legacy BIOS-based personal computers in order to boot an operating...
A master boot record (MBR) is a type of boot sector in the first few blocks of partitioned computer mass storage devices like fixed disks or removable...
replacement for the PC BIOS), it is nevertheless also used for some BIOSs, because of the limitations of master boot record (MBR) partition tables, which use...
switch to the BIOS-based CSM booting upon detecting certain types of partition table on the boot disk, effectively preventing UEFI booting from being performed...
A volume boot record (VBR) (also known as a volume boot sector, a partitionboot record or a partitionboot sector) is a type of boot sector introduced...
boot sector. BIOS-style booting from MBR-partitioned disks is commonly called BIOS-MBR, regardless of it being performed on UEFI or legacy BIOS-based systems...
(GPT) only has the primary partition, doesn't have the extended partition and the logical partition. BIOSbootpartition (BIOS BP) is a share of the storage...
g., the BIOS). Usually, the first sector of the hard disk is the boot sector, regardless of sector size (512 or 4096 bytes) and partitioning flavor (MBR...
On system with BIOS firmware, the BIOS invokes MBR boot code from a hard disk drive at startup. The MBR boot code and the VBR boot code are OS-specific...
the concept of a file system is unknown to the BIOS. Thus, in BIOS-based systems, the duty of a boot loader is to access the content of those files,...
to start the boot code from BIOS. Master boot record Disk partitioningBIOSBoot loader "The MBR (master boot record) and the Partition Tables". DIY DataRecovery...
computing, BIOS (/ˈbaɪɒs, -oʊs/, BY-oss, -ohss; Basic Input/Output System, also known as the System BIOS, ROM BIOS, BIOS ROM or PC BIOS) is firmware...
include BIOS, UEFI, coreboot, Libreboot and Das U-Boot. On the IBM PC, the boot loader in the Master Boot Record (MBR) and the PartitionBoot Record (PBR)...
In computing, the BIOS parameter block, often shortened to BPB, is a data structure in the volume boot record (VBR) describing the physical layout of a...
The partition type (or partition ID) in a partition's entry in the partition table inside a master boot record (MBR) is a byte value intended to specify...
default 64-byte partition table with four partition entries and the two-byte boot signature, which the BIOS requires for a proper boot loader — or even...
systems BIOS and stays resident in memory after boot. Das U-Boot is a bootloader for embedded systems. It is used on systems that do not have a BIOS/UEFI...
Intel-based Macs are able to boot from APM, GPT (GUID Partition Table) and MBR (Master Boot Record, using the BIOS-Emulation called EFI-CSM i.e. the Compatibility...
extended boot record (EBR), or extended partitionboot record (EPBR), is a descriptor for a logical partition under the common DOS disk drive partitioning system...
inspect the BIOS Parameter Block that is contained in the BDP's Volume Boot Record. When a Microsoft operating system converts a GPT-partitioned basic disk...
hidden sectors including the boot sector: this would result in unused sectors at the end of the volume. If a partition contains more sectors than the...
hard drives partitioned on a computer with a BIOS from a particular vendor often could not be read on a computer with a different make of BIOS. The solution...
depending on the BIOS. In the case of a floppy the BIOS interprets its boot sector (first sector) as code, for NTLDR this could be a NTLDR boot sector looking...
be unable to boot from USB even when USB is enabled via such an add-in card. Some computers, particularly older ones, may not have a BIOS that supports...
specification, interrupt 13h, which uses cylinder-head-sector addressing. At boot time, the BIOS of many very old PCs could only access the first 1024 cylinders,...
non-partitioned and partitioned media. In particular, it recognizes the GUID Partition Table (GPT), Apple partition map, PC/Intel BIOSpartition tables...
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