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A Microsoft Reserved Partition, or MSR, is a partition of a data storage device, which is created simply to reserve a chunk of disk space for possible subsequent use by the operating system software of a Windows operating system (Installed to a separate partition). It should be noted that no meaningful data is stored within the MSR; though from the MSR, chunks may be taken for the creation of new partitions, which themselves may contain data structures.〔(【引用サイトリンク】work=Windows and GPT FAQ )〕 An MSR is only created on disks formatted using the newer GPT partition layout, a replacement for the traditional MBR partition layout. The GPT label for this partition type is E3C9E316-0B5C-4DB8-817D-F92DF00215AE.==Purpose== Formerly, on disks formatted using the older MBR partition layout, certain software components used hidden sectors of the disk for data storage purposes. One example of this is the Logical Disk Manager (LDM), which, should the disk be converted from a basic disk to a dynamic disk, would store metadata in a 1 MB area at the end of the disk which was not allocated to any partition.〔(【引用サイトリンク】work=Microsoft TechNet )〕 GPT formatted disks and the UEFI partition specification do not allow hidden sectors. Microsoft reserves a chunk of disk space using this MSR partition type, to provide an alternative data storage space for such software components which previously may have used hidden sectors on MBR formatted disks. Such software components, for example LDM as mentioned above, can create a small software-component specific partition from a portion of the space reserved in the MSR partition. 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「Microsoft Reserved Partition」の詳細全文を読む スポンサード リンク
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