海思3515下，SATA硬盘报错

使用海思3515,做安防产品。大数据量向SATA硬盘写码流文件。linux内核2.6.24，运行一段时间以后，会出现如下错误：
ata2.00: status: { DRDY ERR }
ata2.00: error: { UNC }
ata2.00: configured for UDMA/133
ata2: EH complete
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata2.00: irq_stat 0x40000000
ata2.00: cmd 25/00:08:40:84:9d/00:00:23:00:00/e0 tag 0 dma 4096 in
         res 51/40:08:40:84:9d/00:00:23:00:00/03 Emask 0x9 (media error)
ata2.00: status: { DRDY ERR }
ata2.00: error: { UNC }
ata2.00: configured for UDMA/133
ata2: EH complete
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata2.00: irq_stat 0x40000000
ata2.00: cmd 25/00:08:40:84:9d/00:00:23:00:00/e0 tag 0 dma 4096 in
         res 51/40:08:40:84:9d/00:00:23:00:00/03 Emask 0x9 (media error)
ata2.00: status: { DRDY ERR }
ata2.00: error: { UNC }
ata2.00: configured for UDMA/133
sd 1:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 1:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor]
Descriptor sense data with sense descriptors (in hex):
        72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
        23 9d 84 40
sd 1:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed
end_request: I/O error, dev sda, sector 597525568
ata2: EH complete
sd 1:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
sd 1:0:0:0: [sda] Write Protect is off
sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 1:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
sd 1:0:0:0: [sda] Write Protect is off
sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

请大神们帮忙看一下，这是什么错误？是内核版本太低？还是供电不足，或者是其他原因，谢谢