3/12/18 1 The Evolution of Solid State Drives CHRISTIAN WELCH CPTR 380 MARCH 12, 2018 History • First invented in 1950s • Initially relied on two technologies • Charged Capacitor Read Only Storage (CCROS) • Magnetic core memory • StorageTek marketed a “RAM-based” drive geared for the IBM mainframe market in 1978
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3/12/18
1
The Evolution of Solid State DrivesCH R IST IA N WELCHCPT R 3 80MA R CH 1 2 , 201 8
History• First invented in 1950s
• Initially relied on two technologies• Charged Capacitor Read Only Storage (CCROS)
• Magnetic core memory
• StorageTek marketed a “RAM-based” drive geared for the IBM mainframe market in 1978
3/12/18
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StorageTek STC-4305 – the precursor to modern RAM-based drives
“Recent” History• From ~1980 until ~2000, RAM-
based SSDs dominated the market
• In 2004, BitMicro demonstrated the efficacy of flash-based memory
• Widespread use of flash nearly annihilated RAM-based SSDs
DRAM SSDs 250 3 200,000 0.5 400Notes:1 - Metrics are all normalized as typical rackmount system statistics per U of height (1.75")2 - Latency and IOPs estimates assume same numbers of random reads and writes3 - Latency and IOPs estimates assume 4K block sizes