複選題
20) About SSD (Solid-state disk), which of the following is correct?
(A) SSD is a kind of nonvolatile memory
device
(B) FTL (Flash translation layer) is used to track logical blocks that contain valid data
(C) SSD usually
uses over-provisioning to improve read performance
(D) Wear leveling is used to prevent certain blocks from
being erased repeatedly.
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