NAND, which is the storage media in most SSDs, stores data in cells. Each cell holds a charge that represents data. We’ll relate a cell to a battery as each cell layer is explained.
SLC is the fastest and most costly NAND.
MLC 'costs less' than SLC, because an extra bit added 100% more storage per cell.
TLC 'costs less' then MLC, because an extra bit added 33% more storage per cell.
(See the trend?)
The cost is even more performance, due to even more precision and checks.
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