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The Logical Disk Manager (LDM) is the Microsoft version of a logical volume manager that was first introduced in Windows 2000, and is supported in Windows XP and Windows 7. Microsoft licensed this software from Veritas Software; the two companies then co-developed it further. The logical disk manager’s main purpose is to create and manage dynamic disks.
Dynamic disks are special because they can span multiple physical disk volumes, which allows the disks to be resized dynamically, without the need for rebooting. Unlike basic disks, a dynamic disk volume contains no partitions.