Actually each cell (each bit) is reset to an initial state. It is still blazingly fast, as the erase is: 1) Done in large chunks 2) Done in parallel (mos

Actually each cell (each bit) is reset to an initial state. It is still blazingly fast, as the erase is: 1) Done in large chunks 2) Done in parallel (most SSDs have multiple dies) 3) Does not require data transfers out of the drive. The ERASE also resets the internal data structures (dirty/etc lists).