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)。
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).
三个最重大的挑战分别是垃圾收集、管理坏块和平均读写。
The three most important are garbage collection, managing bad blocks, and wear leveling.
三个最重大的挑战分别是垃圾收集、管理坏块和平均读写。
The three most important are garbage collection, managing bad blocks, and wear leveling.
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