Solid State Drive
A Solid State Drive is a non-volatile data storage device based on random access memory (e.g. flash RAM).
- Context:
- It can (typically) be a Computer Data Storage Device.
- …
- Counter-Example(s):
- a Hard Disk Drive.
- a DRAM Module.
- a Memory Card.
- See: HDD, Data Tape Drive.
References
2013
- http://en.wikipedia.org/wiki/Solid-state_drive
- A solid-state drive (SSD) (also known as a solid-state disk [1][2][3] or electronic disk,[4] though it contains no actual "disk" of any kind, nor motors to "drive" the disks) is a data storage device using integrated circuit assemblies as memory to store persistently. SSD technology uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives, thus permitting simple replacement in common applications.[5] Also, new I/O interfaces like SATA Express are created to keep up with speed advancements in SSD technology.
SSDs have no moving mechanical components. This distinguishes them from traditional electromechanical magnetic disks such as hard disk drives (HDDs) or floppy disks, which contain spinning disks and movable read/write heads.[6] Compared with electromechanical disks, SSDs are typically more resistant to physical shock, run more quietly, have lower access time, and less latency.[7] However, while the price of SSDs has continued to decline in 2012,[8] SSDs are still about 7 to 8 times more expensive per unit of storage than HDDs.
As of 2010[update], most SSDs use NAND-based flash memory, which retains data without power. For applications requiring fast access, but not necessarily data persistence after power loss, SSDs may be constructed from random-access memory (RAM). Such devices may employ separate power sources, such as batteries, to maintain data after power loss.
Hybrid drives or solid state hybrid drives (SSHD)[9][10] combine the features of SSDs and HDDs in the same unit, containing a large hard disk drive and an SSD cache to improve performance of frequently accessed data. These devices may offer near-SSD performance for many applications.
- A solid-state drive (SSD) (also known as a solid-state disk [1][2][3] or electronic disk,[4] though it contains no actual "disk" of any kind, nor motors to "drive" the disks) is a data storage device using integrated circuit assemblies as memory to store persistently. SSD technology uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives, thus permitting simple replacement in common applications.[5] Also, new I/O interfaces like SATA Express are created to keep up with speed advancements in SSD technology.
- ↑ "Texas Memory Systems: Solid State Disk Overview". Texas Memory System Resources. Texas Memory Systems. http://www.ramsan.com/resources/SSDOverview. Retrieved 14 December 2012.
- ↑ Whittaker, Zack. "Solid-state disk prices falling, still more costly than hard disks". Between the Lines. ZDNet. http://www.zdnet.com/solid-state-disk-prices-falling-still-more-costly-than-hard-disks-7000007793/. Retrieved 14 December 2012.
- ↑ "What is solid state disk? - A Word Definition From the Webopedia Computer Dictionary". Webopedia. ITBusinessEdge. http://www.webopedia.com/TERM/S/solid_state_disk.html. Retrieved 14 December 2012.
- ↑ Janssen, Cory. "What is a Solid State Disk (SSD)? - Definition from Techopedia". Tecnopedia. Janalta Interactive Sites. http://www.techopedia.com/definition/2296/solid-state-disk-ssd. Retrieved 14 December 2012.
- ↑ "Solid State Storage 101: An introduction to Solid State Storage". SNIA. January 2009. http://www.snia.org/apps/group_public/download.php/35796/SSSI%20Wht%20Paper%20Final.pdf. Retrieved 9 August 2010.
- ↑ STEC."SSD Power Savings Render Significant Reduction to TCO." Retrieved October 25, 2010.
- ↑ Vamsee Kasavajhala (May 2011). "SSD vs HDD Price and Performance Study, a Dell technical white paper". Dell PowerVault Technical Marketing. http://www.dell.com/us/business/p/d/shared-content~data-sheets~en/Documents~SSD_vs_HDD_Price_and_Performance_Study.pdf.aspx. Retrieved 15 June 2012.
- ↑ Geoff Gasior (21 June 2012). "SSD prices in steady, substantial decline: A look at the cost of the current generation". The Tech Report. http://techreport.com/articles.x/23149.
- ↑ "SSHD: Fast, big and easy on your budget". Seagate. http://www.seagate.com/solutions/solid-state-hybrid/. Retrieved 26 March 2013.
- ↑ "WD shows off its first hybrid drive, the WD Black SSHD". Cnet. http://reviews.cnet.com/hard-drives/wd-black-sshd-1tb/4505-3186_7-35567266.html. Retrieved 26 March 2013.