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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.〔 (【引用サイトリンク】url = http://www.diydatarecovery.nl/kb_mbr_article.htm )〕〔 〕 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:". 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.〔(【引用サイトリンク】url = https://www.gnu.org/software/parted/manual/html_chapter/parted_4.html )〕 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〔(【引用サイトリンク】url = http://windows.microsoft.com/en-us/windows/mark-partition-active )〕 and fdisk. Some modern BIOS test if the bootflag of at least one partition is set. Otherwise they ignore the device in boot-order. So even if the bootloader does not need the flag, it has to be set to start the bootcode from BIOS. ==See also== * Master boot record * Disk partitioning * Boot loader 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boot flag」の詳細全文を読む スポンサード リンク
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