Getting rid of pending sectors

Hello,

 
I own a small private NAS with 2x WD RE4 4TB drives.

One of the drives recently got a number of current pending sectors :

 
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       142

198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       142

 
The smart long self test suceeds.

I’ve tried to force the firmware to reallocate the sectors by reading them.

So far I’ve tried :

dd if=/dev/sdb of=/dev/null bs=4096

badblocks -b 4096 -c 8 -sv -o /root/badblocks.sdb /dev/sdb

 
Neither of both commands changed anything, and the badblocks utility reports 0 bad blocks.

Usually the self test locates at least the bad sectors so I can write to the sector and force reallocation, but nothing here.

 
I’m used to not trust a drive if it gets more than 10 bad sectors, but as it’s a private server, I’m pretty unwilling to spend 300$ into new 4TB RE4 / Gold drives.

 
Any suggestions ?

 
Regards,

Ozy.

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