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SMART: Difference between errors?

Carson Dyle

Carson Dyle

Diamond Member
What's the difference between an "Uncorrectable" sector and a "Reallocated" sector? I would think that any uncorrectable sectors would be reallocated.

Also, what exactly are "Current Pending" sectors? I have drives with current pending sector counts and these counts never change. Do pending sectors get cleared when a drive is reformatted? I know I've seen SMART errors disappear from reports before, but I don't recall the exact circumstances.
 
If you really needed to read it, then an uncorrectable error is lost data.

But, if that sector gets written to, then the new data can be put wherever, and effectively no data ends up lost.

Pending sectors should be cleared as soon as the sector is accessed again, one way or another. They are sectors that are waiting to be remapped. They will generally be remapped when that sector is written to again. AFAIK, a pending sector might be a readable or unreadable sector, but the drive has seen fit to not yet remap it. The HDD makers have tons of leeway in terms of how they handle it.

Formatting will only change anything if you do a bad sector scan, which will just do something because it touches every sector.
 
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