solid-state drive
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solid-state drive


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DEFINITION - An SSD (solid-state drive or solid-state disk) is a storage device that stores persistent data on solid-state flash memory. SSDs actually aren't hard drives at all, in the traditional sense of the term, as there are no moving parts involved. Instead, an SSD has an array of semiconductor memory organized as a disk drive, using integrated circuits (ICs) rather than magnetic or optical media.

This arrangement has many advantages. Data transfer to and from solid-state drives is much faster than electromechanical disk drives. Seek time and latency are also substantially reduced. Users typically enjoy much faster boot times as well. In general, SSDs are also more durable and much quieter, with no moving parts to break or spin up or down. SSDs do, however, have slower write times and a set life expectancy, as there is a finite number of erase/write cycles before performance becomes erratic.

Development and adoption of SSDs has been driven by a rapidly expanding need for higher input/output performance. High performance laptops, desktops or any application that needs to deliver information in real-time or near real-time can benefit from SSDs. Historically, SSDs have been much more expensive than conventional hard drives. Due to improvements in manufacturing technology and expanded chip capacity, however, prices have dropped, leading both consumers and enterprise-level customers to re-evaluate SSDs as viable, if still expensive, alternatives to conventional storage.

In recent years, SSDs have been used in enterprise storage to speed up applications and performance without the cost of adding additional servers. According to storage expert Rick Cook, one of the most potent uses of SSDs is to employ them as a "super cache" in a SAN, dramatically speeding up access to frequently accessed files or applications.

Learn more about Disk drives
Best practices for solid-state drive storage technology: SSD best practices center on identifying I/O-intensive applications so that data storage technology can provide the greatest benefit to IT organizations.
Tiered storage tutorial: Find out what tiered storage is, the key technologies behind it, and how tiered storage can lower operational costs while improving application performance.
Podcast: Solid-state drives entering enterprise storage environments: Jeff Janukowicz, research manager at IDC for solid-state drives and hard drive components, discusses the impact SSDs are expected to have at the enterprise level.
Product Roundup: Solid-state drives in enterprise arrays and servers: Most storage vendors have announced support for SSDs, but only EMC is shipping, and every vendor has a different approach. No wonder storage administrators are confused.
Storage vendors debate where SSDs go in storage infrastructure: Tier 1 storage will eventually consist of solid-state disk technology. But right now, some observers aren't sure that SSD is ready for the enterprise.

LAST UPDATED: 06 Mar 2008

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More resources from around the web:
- According to Storage Magazine, solid state disks are not a flash in the pan.
- Rick Cook wrote a tutorial on solid state devices.
- Wikipedia's entry for solid-state drives explores the history, architecture, commercialization and relative advantages of SSDs.
- Engadget posts frequently about SSDs.
- Storagesearch.com has an SSD Buyer's Guide.





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