Boot flag

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A boot flag is a 1-byte value in a non-extended partition record, within a master boot record. It appears at the beginning of a partition record, as the value 0x80. A value of 0x00 indicates the partition does not have the boot flag set.[1] Any other value is invalid.

Its primary function is to indicate to a MS-DOS/MS Windows-type boot loader which partition to boot. In some cases it is used by Windows XP/2000 to assign the active partition the letter "C:".[2] The active partition is the partition where the boot flag is set. DOS and Windows allow only one boot partition to be set with the boot flag.[3]

Other boot loaders used by third-party boot managers (such as GRUB or XOSL) can be installed to a master boot record and can boot primary or extended partitions, which do not have the boot flag set.

There are many disk editors that can modify the boot flag, such as Disk Management in Windows[4] and fdisk.

See also[edit]

References[edit]

  1. ^ "http://www.diydatarecovery.nl/kb_mbr_article.htm". DIY DataRecovery. Retrieved 2014-12-14. 
  2. ^ Goodell, Dan. "Fixing Windows 2000/XP Drive Letters". Understanding MultiBooting and Booting Windows from an Extended Partition. Retrieved 2014-12-14. 
  3. ^ "Parted User's Manual - 4. Boot Loaders". GNU Project. Retrieved 2014-12-14. 
  4. ^ "Mark a partition as active". Microsoft. Retrieved 2014-12-14.