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Ch9 磁碟管理
第 24 題／共 24 題
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24. SSD、FTL、TRIM、Write Amplification、Wear Leveling
#OS-09-024
中
SSD
FTL
TRIM
Write Amplification
Wear Leveling
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How does OS design adapt for Solid State Drives (SSDs) compared to HDDs?
A
SSDs perform "in-place updates" just like HDDs, allowing data to be overwritten physically in the same location without erasure.
B
The Flash Translation Layer (FTL) maps logical block addresses (LBA) to physical pages, hiding the complexity of erase blocks from the OS.
C
The TRIM command allows the OS to inform the SSD which data blocks are no longer considered in use (e.g., after file deletion), aiding internal Garbage Collection.
D
Write Amplification is a phenomenon where the actual amount of data written to the flash chips is greater than the amount of data written by the host OS.
E
Wear Leveling algorithms are implemented by the OS kernel to ensure all SSD cells effectively have the same lifespan.
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