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=== Storage Spaces ===
Storage Spaces is a [[storage virtualization]] technology which succeeds [[Logical Disk Manager]] and allows the organization of physical disks into logical volumes similar to [[Logical Volume Manager (Linux)]], [[RAID0]], [[RAID1]] or [[RAID5]], but at a higher abstraction level.<ref name="B8_storage_spaces">{{cite web|last=Sinofsky|first=Steven |title=Virtualizing storage for scale, resiliency, and efficiency|url=http://blogs.msdn.com/b/b8/archive/2012/01/05/virtualizing-storage-for-scale-resiliency-and-efficiency.aspx |publisher=Building Windows 8 blog|date=January 5, 2012|access-date=January 6, 2012|archive-date=May 9, 2013|archive-url=https://web.archive.org/web/20130509100721/http://blogs.msdn.com/b/b8/archive/2012/01/05/virtualizing-storage-for-scale-resiliency-and-efficiency.aspx|url-status=dead}}</ref>
A storage space behaves like a physical disk to the user, with [[thin provisioning]] of available disk space. The spaces are organized within a storage pool, i.e. a collection of physical disks, that can span multiple disks of different sizes, performance or technology (USB, SATA, SAS). The process of adding new disks or replacing failed or older disks is fully automatic, but can be controlled with [[PowerShell]] commands. The same storage pool can host multiple storage spaces. Storage Spaces have built-in resiliency from disk failures, which is achieved by either [[disk mirroring]] or [[data striping|striping]] with [[Parity bit|parity]] across the physical disks. Each storage pool on the [[ReFS]] filesystem is limited to 4 PB (4096 TB), but there are no limits on the total number of storage pools or the number of storage spaces within a pool.<ref name="B8_ReFS">{{cite web|url=http://blogs.msdn.com/b/b8/archive/2012/01/16/building-the-next-generation-file-system-for-windows-refs.aspx|title=Building the next generation file system for Windows: ReFS|publisher=Building Windows 8 Blog|date=January 16, 2012|access-date=January 17, 2012|archive-date=May 26, 2013|archive-url=https://web.archive.org/web/20130526085329/http://blogs.msdn.com/b/b8/archive/2012/01/16/building-the-next-generation-file-system-for-windows-refs.aspx|url-status=live}}</ref>
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Windows 8.1 also introduces a manual TRIM function via [[Microsoft Drive Optimizer]] which can perform an on-demand user-requested TRIM operation on internal and external SSDs. Windows 7 only had automatic TRIM for internal SATA SSDs built into system operations such as Delete, Format, Diskpart etc.
However, Windows 8.1 built-in NVMe driver does not support NVMe passthrough protocol. Support for NVMe passthrough protocol was added in Windows 10.<ref>{{Cite web |title=NVMe_Support – smartmontools |url=https://www.smartmontools.org/wiki/NVMe_Support }}</ref>
==See also==
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