JEDEC SSD Specifications Explained

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Endurance rating ‣ Establish a rating system for comparing SSDs. ‣ Provides unique rating for application class. ‣ Rating based on a user-measurable interface activity: TBW. ‣ TBW = TeraBytes Written. − “Decimal” value to be consistent with user interfaces.
Endurance rating The SSD manufacturer shall establish an endurance rating for an SSD that represents the maximum number of terabytes that may be written by a host to the SSD, using the workload specified for the application class, such that the following conditions are satisfied: 1) the SSD maintains its capacity; 2) the SSD maintains the required UBER for its application class; 3) the SSD meets the required functional failure requirement (FFR) for its application class; and 4) the SSD retains data with power off for the required time for its application class. This rating is referred to as TBW. Requirements for UBER, FFR, and retention are defined for each application class.
Page 1 and 2: JEDEC SSD Specifications Explained
Page 3 and 4: What do these standards include?
Page 5 and 6: Reference Documents ‣ JESD22-A117
Page 7 and 8: Key Definitions ‣ Erase block - T
Page 9 and 10: Key Definitions ‣ Solid state dri
Page 11 and 12: Key Definitions ‣ Write amplifica
Page 13 and 14: # corrupt sectors per drive UBER eq
Page 15 and 16: UBER determination ‣ Although the
Page 17 and 18: WAF ‣ Factors that impact WAF: -
Page 19 and 20: WAF example The figure shows one NA
Page 21 and 22: WAF example Note that had the examp
Page 23: Application classes ‣ Current app
Page 27 and 28: Temperatures and data retention ‣
Page 29 and 30: Endurance rating example The estima
Page 31 and 32: Endurance rating example The NAND c
Page 33 and 34: Verification goals ‣ Reasonable t
Page 35 and 36: Direct versus extrapolation ‣ Bot
Page 39 and 40: Direct method ‣ Best method but n
Page 41 and 42: General requirements for extrapolat
Page 43 and 44: Accelerated write rate through modi
Page 45 and 46: Extrapolation of FFR and bad- locat
Page 47 and 48: Reduced-capacity SSD ‣ Qualificat
Page 49 and 50: FFR and UBER estimation from compon
Page 51 and 52: Endurance workloads ‣ Client work
Page 53 and 54: Enterprise workload ‣ Several wor
Page 55 and 56: Questions

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