Reallocated Sector Count Explained
Reallocated sectors can indicate that a hard drive has substituted spare sectors for areas that became unreliable.
Independent resource: Independent informational resource. Not affiliated with, endorsed by, or sponsored by Crystal Dew World or the developers of CrystalDiskInfo or CrystalDiskMark. This page is educational and does not host software.
In this articleWhat reallocation meansWhy trend mattersDo not wait for a perfect thresholdPair it with other symptoms
What reallocation means
A storage device may remap a logical sector to a spare physical location when the original area is no longer considered reliable.
Why trend matters
A small historical count that never changes is different from a count that keeps rising. Growth suggests the media problem is continuing.
Do not wait for a perfect threshold
Vendor thresholds are not a promise that data is safe until the exact threshold is crossed. If important information is on a drive with worsening media indicators, backup and replacement planning are prudent.
Pair it with other symptoms
Pending sectors, uncorrectable errors, read slowdowns and system event logs can provide context. One field should not be interpreted in isolation.
Practical takeaway: interpret storage data in context, protect important files with independent backups, and compare trends rather than relying on a single screenshot.