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In data storage, disk mirroring is the replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability. It is most commonly used in RAID 1 . A mirrored volume is a complete logical representation of separate volume copies.
Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.
File synchronization is commonly used for home backups on external hard drives or updating for transport on USB flash drives. BitTorrent Sync, Dropbox, SKYSITE, Nextcloud, OneDrive, Google Drive and iCloud are prominent products. Some backup software also support real-time file sync.
This is a comparison of commercial software in the field of file synchronization. These programs only provide full functionality with a payment. As indicated, some are trialware and provide functionality during a trial period; some are freemium, meaning that they have freeware editions.
The Logical Disk Manager (LDM) is an implementation of a logical volume manager for Microsoft Windows NT, developed by Microsoft and Veritas Software.It was introduced with the Windows 2000 operating system, and is supported in Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows 8, Windows 10 and Windows 11.
Disk cloning is the process of duplicating all data on a digital storage drive, such as a hard disk or solid state drive, using hardware or software techniques. [1] Unlike file copying, disk cloning also duplicates the filesystems, partitions, drive meta data and slack space on the drive. [2]
A typical case where a RAID enters degraded mode is a simple two-drive mirror after a power failure – it is unlikely the drives are in sync. Every time blocks are written to the storage elements (physical drives, in this case), certain accounting information is updated after the write. The RAID controller will notice that the storage elements ...
This affects dual-booting, and external portable hard drives. Specifically, the persistent shadow copies created by Windows Vista on an NTFS volume are deleted when Windows XP or Windows Server 2003 mount that NTFS volume. This happens because the older operating system does not understand the newer format of persistent shadow copies. [33]