Write through cache drive reports that writes are complete after they have been

Write through cache drive reports that writes are

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Write through cache : drive reports that writes are complete after they have been written to disk Today, some disks include flash memory for persistent caching (hybrid drives) 8
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Beyond Spinning Disks Hard drives have been around since 1956 The cheapest way to store large amounts of data Sizes are still increasing However, hard drives are typically the slowest component in most computers CPU and RAM operate at GHz PCI-X and Ethernet are GB/s Hard drives are not suitable for mobile devices Fragile mechanical components can break The disk motor is extremely power hungry 9
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Solid State Drives NAND flash memory-based drives High voltage is able to change the configuration of a floating-gate transistor State of the transistor interpreted as binary data 10 Flash memory chip Data is striped across all chips
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Advantages of SSDs More resilient against physical damage No sensitive read head or moving parts Immune to changes in temperature Greatly reduced power consumption No mechanical, moving parts Much faster than hard drives > 1GB/s vs. 400 MB/s for hard drives No penalty for random access Each flash cell can be addressed directly No need to rotate or seek 11
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  • Fall '14
  • Seon Kim
  • Flash memory, Solid-state drive

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