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Dynamic Disk Management is a proprietary system from Microsoft that divides a hard disk into volumes, allowing for larger capacity and redundancy. It is compatible with most Windows operating systems and supports up to 1000 volumes per disk group. It can be converted from basic disks and supports software RAID-5 volumes. It is more suited for server environments due to its capabilities for disk storage growth, redundancy, and flexibility.
A dynamic disk is a hard disk that has been formatted to allow for features beyond those available when a disk is formatted as a basic disk. Dynamic Disk Management is a proprietary disk management system from Microsoft that first became available with the release of the Microsoft Windows 2000 client and server operating systems. Instead of having one primary partition and one extended partition with logical drives, as is the case with a basic disk, dynamic disk management divides a hard disk into volumes. Volumes can be increased in size using the unallocated space available on the drive or extended in multiple ways across more than one disk. Extending a dynamic disk can provide larger volume capacity and redundant features, which aid in data loss prevention and data recovery.
Most Windows operating systems released after Windows 2000 are capable of using dynamic disks, but there are exceptions that do not support this feature. Dynamic Disk Management is compatible with Master Boot Record (MBR) and Globally Unique Identifier Partition Table (GPT) partitioning styles. It uses the New Technology File System (NTFS) instead of the File Allocation Table (FAT) file system for volumes. You can create up to 1000 volumes in a disk group on a dynamic disk, but Microsoft recommends a maximum of 32. Each of these volumes can span up to 32 physical disks.
Partition information for basic disks is stored in a partition table at the beginning of a physical disk, while dynamic disks store partition data at the end of the disk in a database file. Basic disks can be converted to dynamic disks, provided there is enough space on the disk for the convert utility to store the information, but they cannot be converted back quickly. Using dynamic disks with dual or multi-boot systems is not recommended due to compatibility issues with alternative operating systems and the way Windows stores information about dynamic disks in the registry.
Volumes can be extended to become software RAID-5 (Redundant Array of Independent Disks-5) volumes, which provide excellent fault tolerance by eliminating small data and parity drives across at least 3 disks. Mirrored extents of dynamic disks allow for two full active copies of a volume to exist and be updated simultaneously. Spanned, stripped, and simple volume extents are also available, but do not provide fault tolerance.
While Windows client operating systems have the ability to use dynamic disks, they are generally used and more suited to server environments. The main advantages of using this type of disk management system are the capabilities of disk storage growth, redundancy, and flexibility when working with physical disks. All these features are often used to troubleshoot server situations.
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