...C) 闪存上的每一位(bit)可以被写操作置成逻辑0 可是把逻辑 0 置成逻辑 1 却不能按位(bit)来操作，而只能按擦写块（erase block）为单位进行擦写操作擦写块的大小从 4K 到128K 不等从上层来看，擦写所完成的功能就是把擦写块内的每一位都重设置（reset）成逻辑...
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Erase Block Summary 擦除块摘要
block mass erase procedure 块擦除程序
Block Erase 块擦除 ; 区段式擦除
Data-block Erase Table 数据块擦除次数表
Erase Failure block Count 擦除错误块计数
Dynamic wear leveling addresses the problem of a limited number of Erase cycles for a given block.
动态平均读写解决了块的Erase周期的次数限制。
Recall that flash devices are consumable parts: You can perform a finite number of Erase cycles on each block before the block becomes bad (and must therefore be tagged by bad block management).
前面提到flash设备属于耗损品：在变成坏块以前，可以执行有限次数的反复的Erase操作(因此必须由坏块管理进行标记)。
Here's why this could happen: the metadata update would erase any reference to the original data block(s), but would point to data block(s) on disk that were never filled with data.
出现这种情况的原因如下：元数据更新删除了对原先数据块的任何引用，却指向磁盘上没有填充过数据的数据块。
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