hesela.devNVMe Data Units Written
NVMe Data Units Written is the SMART / Health Information log counter of host-written data, excluding metadata, in rounded-up groups of 1,000 units of 512 bytes.
One reported unit corresponds to a 512000-byte quantum. For nonzero raw value v, multiplying v by 512000 gives the upper edge of the reporting bucket, not an exact byte total. Zero means the amount is not reported. Bytes 48 through 63 hold a 128-bit counter: preserve integer precision, for example with a decimal string or BigInt rather than an unrestricted JavaScript Number. [1]
Relations
- related
- nvme-smart-log, nvme-percentage-used
Limitations
- Host writes are not physical NAND writes, so this counter alone cannot measure write amplification; interval differences also retain the rounding uncertainty of the two readings. [1]