SRAM and flash memory

Which correctly describes "overprovisioning" in an SSD?

  1. AWriting data in two places for redundancy
  2. BInstalling more flash memory than the capacity shown to the user and using the extra area for garbage collection and longer life
  3. CInstalling less flash memory than the displayed capacity
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Answer: B. Installing more flash memory than the capacity shown to the user and using the extra area for garbage collection and longer life

Overprovisioning means installing more flash memory than the user-visible capacity and using the surplus for keeping free blocks available, garbage collection and replacing bad blocks. The larger the surplus, the more stable the write performance and the longer the life.

  • A. Duplicating data is mirroring, a different mechanism.
  • B. Correct. The extra area is used for internal management.
  • C. With less than the displayed capacity, the stated capacity could not be used.
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More SRAM and flash memory questions

  1. Which correctly describes "write amplification" in an SSD?
  2. What is the basic unit for reading and writing (programming) in NAND flash memory?
  3. Which interface standard, built on PCI Express, is widely used to connect high-speed SSDs to the host?
  4. In SRAM, which correctly describes the "data retention voltage" that sets the lower limit when the supply is lowered during standby to reduce leakage?
  5. In a 6T SRAM cell, which design is needed so that the cell contents are not flipped during a read (to prevent read upset)?