Definition Edit

NAND flash memory

includes PIM data, graphics, audio, video, and other user file. This type of memory generally provides the [forensic] examiner with the most useful information in most cases. NAND flash memory may leave multiple copies of transaction-based files (e.g., databases and logs) due to wear leveling algorithm sand garbage collection routines. Since NAND flash memory cells can be programed for only a limited amount of time before they become unreliable, wear leveling algorithms are used to increase the life span of Flash memory storage, by arranging data so that erasures and re-writes are distributed evenly across the SSD. Garbage collection occurs because NAND flash memory cannot overwrite existing data, the data must first be erased before writing to the same cell.

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