[PLUG] Is My Disk Toast?

I've got a HDD that starting throwing errors to dmesg (below). It happened on about 8 different sectors recently, and happens repeatedly. I've been googling around and learning about smart, but the diagnostic seems (also below) to indicate the disk is good (Reallocated_Sector_Ct and Reallocated_Event_Count have raw values 0).

Is this disk dying, or can I run a tool to reallocate the bad sectors?

print_req_error: I/O error, dev sdc, sector 5911268904 flags 0
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x8 SErr 0x0 action 0x0
ata3.00: irq_stat 0x40000008
ata3.00: failed command: READ FPDMA QUEUED
ata3.00: cmd 60/08:18:f0:d8:56/00:00:60:01:00/40 tag 3 ncq dma 4096 in
res 41/40:00:f0:d8:56/00:00:60:01:00/00 Emask 0x409 (media error) <F>
ata3.00: status: { DRDY ERR }
ata3.00: error: { UNC }
ata3.00: configured for UDMA/133
sd 2:0:0:0: [sdc] tag#3 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 2:0:0:0: [sdc] tag#3 Sense Key : Medium Error [current]
sd 2:0:0:0: [sdc] tag#3 Add. Sense: Unrecovered read error - auto reallocate failed

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