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A BIOS boot partition is needed on GPT-partitioned storage devices to hold the second stages of GRUB. On traditional [[Master Boot Record|MBR]]-partitioned devices, the [[disk sector]]s 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]].
== Overview ==
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