This size gets reduced as portions of the MSR are taken to be used, as described above.īeginning in Windows 10, the minimum size of the MSR is 16 MB which the installer allocates by default. The starting size of an MSR depends on disk size and usually aligns with the following table. Such software components can create a small software-component specific partition from a portion of the space reserved in the MSR partition. 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. The UEFI specification does not allow hidden sectors on GPT-formatted disks. For example, the Logical Disk Manager (LDM), on dynamic disks, stores metadata in a 1 MB area at the end of the disk which is not allocated to any partition. Formerly, on disks formatted using the master boot record (MBR) partition layout, certain software components used hidden sectors of the disk for data storage purposes.
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