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I install freenas and activated smartd and I got a report of 3 faulty drives.

On drive /dev/ad20 (Western digital green 1500gb)

Device: /dev/ad20, 4 Offline uncorrectable sectors
Device: /dev/ad20, 6 Currently unreadable (pending) sectors

On drive /dev/ad12 (Western digital green 1500gb)

Device: /dev/ad12, 5 Offline uncorrectable sectors
Device: /dev/ad12, 5 Currently unreadable (pending) sectors

On drive /dev/ad14 (Brand new SSD OCZ 30gb)

Device: /dev/ad14, Failed SMART usage Attribute: 9 Power_On_Hours.
Device: /dev/ad14, 161 Offline uncorrectable sectors

I tested /dev/ad12 with DLG Diagnostic and I got no error.

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What is really important is any changes. If those values increase then you have problems. If they remain stable then, while not ideal, the situation is probably acceptable - assuming of course you have working backups.

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Shall I just take your word for it, or is there an explanation for this reasoning? –  Phil May 30 '12 at 16:21
    
@Phil - In short if the values are stable then the disk isn't degrading further. –  Cry Havok May 30 '12 at 21:25
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