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I'm running a Debian Jessie Machine with an external 3TB Hard Drive. The drive has gone offline twice in the last few days, trying to [ls] results in nothing to display, same in Dolphin.

Running smartctl -a /dev/sdc results in the following. Note that this drive is only a few months old, but it holds my fairly large video collection, managed and Viewed using Plex Media Server.

smartctl 6.4 2014-10-07 r4002 [x86_64-linux-3.16.0-4-amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.14 (AF)
Device Model:     ST3000DM001-1E6166
Serial Number:    Z1F4HXVG
LU WWN Device Id: 5 000c50 065ca347a
Firmware Version: SC48
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Dec 10 21:04:09 2014 GMT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART Status command failed: scsi error medium or hardware error (serious)
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.
See vendor-specific Attribute list for marginal Attributes.

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (  592) seconds.
Offline data collection
capabilities:                    (0x73) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        No Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        ( 361) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x3081) SCT Status supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   113   099   006    Pre-fail  Always       -       55323488
  3 Spin_Up_Time            0x0003   092   091   000    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   100   100   020    Old_age   Always       -       55
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   058   052   030    Pre-fail  Always       -       150347021957
  9 Power_On_Hours          0x0032   095   095   000    Old_age   Always       -       5157
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   020    Old_age   Always       -       48
183 Runtime_Bad_Block       0x0032   099   099   000    Old_age   Always       -       1
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0 0 0
189 High_Fly_Writes         0x003a   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0022   056   037   045    Old_age   Always   In_the_past 44 (Min/Max 41/52 #7782)
191 G-Sense_Error_Rate      0x0032   100   100   000    Old_age   Always       -       0
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       5
193 Load_Cycle_Count        0x0032   096   096   000    Old_age   Always       -       8971
194 Temperature_Celsius     0x0022   044   063   000    Old_age   Always       -       44 (0 16 0 0 0)
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      -       3274h+33m+50.476s
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      -       6233106761
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      -       8133666728

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
  • Looks fine to me. Check dmesg when the failure happens. Could be a bad cable (or the cable is bent too much). – jordanm Dec 10 '14 at 21:28
  • What about the Pre-Fail and Old_age comments and also the SMART Status command failed: scsi error medium or hardware error (serious) – aSystemOverload Dec 10 '14 at 21:44
  • Doesn't look fine to me. Change the disk and restore. (Offline uncorrectable should be the clue). – Deer Hunter Dec 11 '14 at 5:16
  • Offline uncorrectable is 0, no problem. The SMART Status command failed: scsi error medium or hardware error (serious) is probably due to the enclosure not passing on all commands correctly. You don't say how this disk is connected: USB? eSATA? Also running a smart self-test should be done regularly, e.g. via smartd, configured through /etc/smartd.conf (at least on Debian). – wurtel Dec 11 '14 at 8:45
  • It is a USB3.0 drive. I've installed smartd, not set it up yet though. Just had to reboot, going through boot sequence said something about emergency situation and to do journalctl -xb, it's not finished the boot sequence, having issues with one of the hard drives, think it's this one, can't remember which is /dev/sdd. Waiting for it to finish so I can check the hard drive. – aSystemOverload Dec 11 '14 at 23:13

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