Restore disk geometry after OS reinstall

Hi,

The HDD#4 S/N ****1338 is dead and generating a lot of errors. You should shut down from the GUI, remove this HDD (double check the S/N) and try boot up the NAS again. If the data volume is then accessible, you should insert a replacement HDD asap to resync the volume to a redundant state.

Serial: *****1338
ATA Error Count: 2297
Current Pending Sector Count: 17
Uncorrectable Sector Count: 263

[Fri Jan  6 08:44:57 2017] ata1.00: status: { DRDY ERR }
[Fri Jan  6 08:44:57 2017] ata1.00: error: { UNC }
[Fri Jan  6 08:44:57 2017] ata1.00: configured for UDMA/133
[Fri Jan  6 08:44:57 2017] sd 0:0:0:0: [sda] tag#24 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[Fri Jan  6 08:44:57 2017] sd 0:0:0:0: [sda] tag#24 Sense Key : Medium Error [current] [descriptor] 
[Fri Jan  6 08:44:57 2017] sd 0:0:0:0: [sda] tag#24 Add. Sense: Unrecovered read error - auto reallocate failed
[Fri Jan  6 08:44:57 2017] sd 0:0:0:0: [sda] tag#24 CDB: Read(10) 28 00 00 05 a6 e8 00 00 08 00
[Fri Jan  6 08:44:57 2017] blk_update_request: I/O error, dev sda, sector 370408

You should also see warnings about this HDD in the logs section of the GUI:

[16/11/08 11:02:09 CET] notice:disk:LOGMSG_SMART_UNCORR_ERR_WARN Detected high uncorrectable error count: [263] on disk 4 (Internal) [WDC WD20EZRX-00D8PB0, *******1138]. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.
[16/11/08 11:03:27 CET] notice:disk:LOGMSG_SMART_ATA_ERR_30DAYS_WARN Detected increasing ATA error count: [1890] on disk 4 (Internal) [WDC WD20EZRX-00D8PB0, *******1138] 1 times in the past 30 days. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.
<snip>
[16/11/22 15:19:12 CET] notice:disk:LOGMSG_SMART_ATA_ERR_30DAYS_WARN Detected increasing ATA error count: [2077] on disk 4 (Internal) [WDC WD20EZRX-00D8PB0, *******1138] 7 times in the past 30 days. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.
[16/11/22 15:36:36 CET] notice:disk:LOGMSG_SMART_ATA_ERR_30DAYS_WARN Detected increasing ATA error count: [2101] on disk 4 (Internal) [WDC WD20EZRX-00D8PB0, *******1138] 8 times in the past 30 days. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.
[16/11/22 15:40:11 CET] notice:disk:LOGMSG_SMART_ATA_ERR_30DAYS_WARN Detected increasing ATA error count: [2113] on disk 4 (Internal) [WDC WD20EZRX-00D8PB0, *******1138] 9 times in the past 30 days. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.