Thanks. The gptf function failed the first time, saying that it wasn't a good idea because the partition was in use, but seemed to work the 2nd time. I've now rebooted and the web interface is reporting hardware problems with the internal hard disk, but it's hard to tell what sort of problems it has found. The info it reported is below - does this indicated what the problem is?
isk Information
SMART Status PASSED
Model Family Western Digital AV-GP (AF)
Device Model WDC WD20EURS-63S48Y0
Serial Number WD-WCAZAH996825
LU WWN Device Id 5 0014ee 25caeab45
Firmware Version 51.0AB51
User Capacity 2,000,398,934,016 bytes [2.00 TB]
Sector Sizes 512 bytes logical, 4096 bytes physical
Device is In smartctl database [for details use: -P show]
ATA Version is ATA8-ACS (minor revision not indicated)
SATA Version is SATA 2.6, 3.0 Gb/s
Local Time is Wed Apr 5 12:59:15 2017 BST
SMART support is Available - device has SMART capability.
SMART support is Enabled
Attributes
ID Name Flags Raw Value Value Worst Threshold Life Left Notes
1 Raw_Read_Error_Rate POSR-K 0 200 200 051 -
3 Spin_Up_Time POS--K 6783 164 159 021 -
4 Start_Stop_Count -O--CK 3606 097 097 000 97% -
5 Reallocated_Sector_Ct PO--CK 0 200 200 140 -
7 Seek_Error_Rate -OSR-K 0 100 253 000 -
9 Power_On_Hours -O--CK 26032 065 065 000 65% -
10 Spin_Retry_Count -O--CK 0 100 100 000 100% -
11 Calibration_Retry_Count -O--CK 0 100 100 000 100% -
12 Power_Cycle_Count -O--CK 3606 097 097 000 97% -
192 Power-Off_Retract_Count -O--CK 3601 196 196 000 -
193 Load_Cycle_Count -O--CK 4 200 200 000 -
194 Temperature_Celsius -O---K 38 112 088 000 -
196 Reallocated_Event_Count -O--CK 0 200 200 000 -
197 Current_Pending_Sector -O--CK 0 200 200 000 -
198 Offline_Uncorrectable ----CK 0 100 253 000 -
199 UDMA_CRC_Error_Count -O--CK 0 200 200 000 -
200 Multi_Zone_Error_Rate ---R-- 0 100 253 000 -
Self-test logs
No. Description Status Remaining When First Error LBA
# 1 Short offline Completed without error 00% 26032 -
