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Microsoft expects an MSR to be present on every GPT disk, and recommends it to be created as the disk is initially partitioned. [4] The GPT label for this partition type is E3C9E316-0B5C-4DB8-817D-F92DF00215AE. [2] The Microsoft-recommended size of MSR (which Windows Setup uses by default) is different for each version of Windows:
Like MBR, GPT uses logical block addressing (LBA) in place of the historical cylinder-head-sector (CHS) addressing. The protective MBR is stored at LBA 0, and the GPT header is in LBA 1, with a backup GPT header stored at the final LBA. The GPT header has a pointer to the partition table (Partition Entry Array), which is typically at LBA 2 ...
All Windows operating systems from Windows 95 onwards can be located on (almost) any partition, but the boot files (io.sys, bootmgr, ntldr, etc.) must reside on a primary partition. However, other factors, such as a PC's BIOS (see Boot sequence on standard PC ) may also impose specific requirements as to which partition must contain the primary OS.
Microsoft-defined GPT attribute flags for BDPs [1] Bit number Meaning 60: The volume is read-only and may not be mounted read-write. 62: The volume is hidden. 63: The operating system may not automatically assign a drive letter to the volume.
An alternative is to use multiple GUID Partition Table (GPT or "dynamic") volumes for be combined to create a single NTFS volume larger than 2 TiB. Booting from a GPT volume to a Windows environment in a Microsoft supported way requires a system with Unified Extensible Firmware Interface (UEFI) and 64-bit [b] support. [27]
EasyBCD has a number of bootloader-related features that can be used to repair and configure the bootloader. From the "Manage Bootloader" section of EasyBCD, it is possible to switch between the BOOTMGR bootloader (used since Windows Vista) and the NTLDR bootloader (used by legacy versions of Windows, from Windows NT to Windows XP) in the MBR from within Windows by simply clicking a button.
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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]