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An SSD write cycle is a NAND flash program/erase (P/E) cycle: data is programmed into one or more pages in an erase block, and that block is erased so its pages can be reused. It describes activity inside the flash memory—not one full cycle consumed by every file save or host write.
What happens during an SSD write cycle?
JEDEC defines a P/E cycle as “the writing of data to one or more pages in an erase block and the erasure of that block, in either order.” A page is programmed in a single operation; an erase block contains multiple pages and is erased as a unit.
In practical terms, NAND cells that have been written must be erased before they can be used again. SanDisk explains this erase-before-reuse behavior and how repeated write, erase, and rewrite activity wears the cells over time (SanDisk’s SSD endurance and wear information).
Does each file save use one write cycle?
No. A file save is a host-level write request, not necessarily one P/E cycle applied uniformly across the drive. The SSD controller manages data placement and erasure across physical flash. Wear leveling spreads P/E activity across physical locations, even when writes are unevenly distributed across the logical drive.
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The amount written internally can also differ from the amount sent by the host. JEDEC defines the write amplification factor (WAF) as NVM data written divided by host data written. It varies with workload and can change over the drive’s lifetime, so host writes do not map one-to-one to NAND cycling.
How is a P/E cycle different from TBW?
A P/E cycle describes NAND-level program-and-erase activity. TBW, or terabytes written, is a drive-level endurance rating: the amount of data that may be written to the SSD while it meets applicable requirements. It is not a raw count of cell cycles. JEDEC says the rating depends on factors such as NAND cycling capability, wear-leveling implementation, write amplification, and the workload used to characterize the drive (JEDEC JESD218).
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TBW figures may be based on a defined JEDEC workload or a vendor-specific workload. Kioxia discusses why workload context matters when interpreting TBW and NAND endurance (Kioxia’s overview of TBW, WAF, and NAND flash endurance). When comparing endurance specifications, consider the stated TBW, its workload basis, drive capacity, and warranty rather than treating a P/E-cycle number as a complete measure of usable life.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How many write cycles does an SSD last?
There is no single P/E-cycle count that applies to every SSD. NAND capability, drive design, wear leveling, write amplification, and workload all affect endurance. Use the specific drive’s published specifications and their stated conditions; a generic cycle count cannot establish how long a particular SSD will last.
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A TBW rating is an endurance specification tied to stated requirements, not a promise that the SSD will fail as soon as it reaches that number. It should be read in the context of the manufacturer’s rating and workload basis.
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