A Shift in Data Storage Todd Dinkelman Micron Technology, Inc.

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Wear-Leveling Example (continued) � An 8GB MLC-based SSD contains 32,768 independent blocks (each block is 256KB of data) � If we took the previous example and distributed the cycles over all 32,768 blocks, each block would have been programmed once after 9 hours � If you provided perfect wear-leveling on an 8GB drive, you could erase and program a block every second, every day for over 10 years! 10,000 X 32,768 327,680,000 = = 3,792 days = 10.38 years 60 X 60 X 24 86,400 Santa Clara, CA USA August 2008 18
Write Amplification � Additional write overhead due to garbage collection and wear-leveling • Write Amplification = Flash Writes / Host Writes � Influence on host data patterns • Large number of small random transfers increases write amplification � Influenced by number of spare blocks and static data • Keeping a percentage of the drive as spares will bound the write amplification Santa Clara, CA USA August 2008 19
Page 1 and 2: SSDs A Shift in Data Storage Todd D
Page 3 and 4: What is Being Called an SSD? � US
Page 5 and 6: SATA interface connector The Simpli
Page 7 and 8: SSDs in Computing Relative Latency
Page 9 and 10: MLC and SLC Differences � SLC •
Page 11 and 12: $/GB SSD Average Price/GB 1.8" HDD
Page 13 and 14: NAND Error Rate � Bit Error Rate
Page 15 and 16: Endurance Factors � Wear-leveling
Page 17: Wear-Leveling Example � MLC devic
Page 21 and 22: SSD Endurance Calculation � Write
Page 23 and 24: Times per Day (Count) 60 50 40 30 2
Page 25 and 26: Summary � SSDs bring many advanta

A Shift in Data Storage Todd Dinkelman Micron Technology, Inc.

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