Read errors on a sector will not remap the sector immediately (since the correct value cannot be read and so the value to remap is not known, and also it might become readable later) instead, the drive firmware remembers that the sector needs to be remapped, and will remap it the next time it's written. If an unstable sector is subsequently read successfully, the sector is remapped and this value is decreased. ![]() In the block from the wiki I posted, you can read about it.Ĭount of "unstable" sectors (waiting to be remapped, because of unrecoverable read errors). NOW is the time to replace the unit while it is still working just fine, and transferring its data to a new one will be trouble-free.It depends on how the harddisk firmware treats the bad sectors. ![]() At some point the HDD's SMART system sends out a warning that the remaining stock is small and thus it will not be able to do the automatic replacements at some time in the future. Over the life of the drive as these spares are used as replacements, the stock of unused spares still available is depleted. However, there is a limit to how many a HDD has, and that is linked to the overall size of the unit. This is a background action that even the host computer's OS does not know about. These are used when needed to replace Sectors that become weak or fail outright so that the unit keeps on working. Here's my guess, without knowing something important: what is the capacity of each of those drives? I am guessing that the older one with a SATA 3.0 Gb/s interface is smaller than the newer unit.Īnyway, the point is that any HDD as new has a semi-hidden set of good but unused Sectors available as spares.
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