在 Ext2fs 中，为了在一个扇区中擦除单个字节，必须将整个扇区复制到 RAM，然后擦除，然后重写入。

To erase a single byte in a sector in Ext2fs, a whole sector has to be copied to RAM, erased, then rewritten.

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e选项确定闪存的擦除扇区大小(通常是64千字节)。

The -e option specifies the erase sector size of the flash (typically 64 kilobytes).

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FLASH通常是按照扇区来擦除整块的数据。

FLASH erases in much larger chunks of memory commonly referred to as sectors.

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