Source – Courtesy Music Sorter at Wikipedia, CC BY-SA 3.0Įach page may be written to individually, but pages cannot be rewritten until erased, and erasing can only be done in whole blocks. The following diagram assumes 256 KB blocks, but the concept is the same regardless of the block size. Most modern SSDs uses NAND with blocks of 128 pages for a block size of 512 KB, although some drives, especially older ones, may use 256 KB or smaller blocks. NAND flash is divided into blocks, each consisting of a set of pages typically 4 KB in size (plus error-correcting codes).To understand why this is the case, it is necessary to explain how SSDs work on the inside. Repeatedly overwriting a file before deleting it will not securely erase it on an SSD-the data would just be written elsewhere on the NAND. Because of the nature of NAND flash memory, SSDs cannot directly overwrite data.
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