SSD 也整合了 NAND 快闪装置的备用区块。这些备用区块通常位于硬盘的 OP 空间,而且使用者无法存取。如果 NAND 装置在数据块中有过多错误,则会将该区块标记为「错误区块」并汰换。因此,使用「备用区块」可延长 SSD 的使用寿命和耐用度。

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