I just bought a new ST3000DM001 (Seagate Barracuda). I ran "badblocks" on it and no problems were found, however CrystalDiskInfo reports "Reallocated Sectors" value of 1.
Should I worry? Or is this normal for new/large drives (this one is 3TB)?
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All modern drives have faults. (Old ones also have faults but there you read the bad sectors from the label on the drive. And I have not done this since we used 7MB -yes, mega, not giga- byte drives).
So no. Reallocated sectors is normal.
Increasing numbers of reallocated sectors on the other hand is worrying.
My advice would be to monitor it. If the number of reallocated sectors keeps increasing, or of that rate rapidly increases then it is time for factory tools testing and a RMA. If it stays at or nearly at the same number then it is just business as normal.