Disk Wear & Performance
Check SSD life used and whether HDD fragmentation is hurting random access.
Estimate SSD wear from total bytes written versus its endurance rating, and flag HDD fragmentation drag.
Result
When a drive is actually aging
Scenario: your SSD is a few years old and you wonder if it is wearing out, or your aged HDD feels slow on small files. This separates the two failure modes.
Example: a 600 TBW drive with 60 TB written is 10% used — “Healthy.” An HDD at 25% fragmentation shows a noticeable random-read penalty that a SSD would not.
Boundaries: SSD endurance is rated in TBW; most consumer drives outlive their useful performance window. Fragmentation matters for spinning disks, not SSDs — never defragment an SSD, only trim it.
FAQ: when should I replace an SSD? Once life used passes about 60% on a drive holding critical data, plan a replacement; near 90% replace soon. Back up regardless of wear — wear is only one failure mode.