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Magnetic disk drives have been in use for decades. Their behavior is well understood, predictable, and assumptions about disk performance are deeply ingrained in the industry and frequently in the applications that use disk storage. This paper will review types of solid state storage products, introduce the flash memory technology that underlies the recent explosion in solid state storage availability, and show how flash memory is used to build such a wide range of storage devices. Finally, it will explain the uses for which solid state disk technology is best suited in products like the HP EVA and XP arrays, and offer some opinions about the future of this technology.
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