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The MountedDevices subkey stores the database of mounted devices for the NTFS file system. This database associates persistent volume names with unique internal indentifiers for volumes. The internal identifiers often include the disk signatures of the volumes. This pairing enables NTFS to maintain the identity and persistent name of a volume, even when its variable device name changes.

NTFS uses this subkey to support mounted drives on all types of volumes, including removable drives and CD-ROM drives.

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This subkey replaces the Disk subkey in Windows NT 4.0 and earlier. However, its contents and use are changed for Windows 2000.