The error only happens trying to read the overall health, the rest of the values can be read fine, yet udisks refuses to report anything:

psusi@faldara:~$ sudo skdump /dev/sdc
Device: sat16:/dev/sdc
Type: 16 Byte SCSI ATA SAT Passthru
Size: 35304 MiB
Model: [WDC WD360GD-00FNA0]
Serial: [WD-WMAH91337618]
Firmware: [35.06K35]
SMART Available: yes
Quirks:
Awake: yes
SMART Disk Health Good: Input/output error
Off-line Data Collection Status: [Off-line data collection activity was completed without error.]
Total Time To Complete Off-Line Data Collection: 1572 s
Self-Test Execution Status: [The previous self-test routine completed without error or no self-test has ever been run.]
Percent Self-Test Remaining: 0%
Conveyance Self-Test Available: yes
Short/Extended Self-Test Available: yes
Start Self-Test Available: yes
Abort Self-Test Available: yes
Short Self-Test Polling Time: 2 min
Extended Self-Test Polling Time: 28 min
Conveyance Self-Test Polling Time: 5 min
Bad Sectors: 0 sectors
Powered On: 1.7 years
Power Cycles: 5260
Average Powered On Per Power Cycle: 2.8 h
Temperature: 35.0 C
Attribute Parsing Verification: Good
Overall Status: Input/output error
ID# Name                        Value Worst Thres Pretty      Raw            Type    Updates Good Good/Past
  1 raw-read-error-rate         200   200    51   0           0x000000000000 prefail online  yes  yes 
  3 spin-up-time                 88    84    21   2.1 s       0x340800000000 prefail online  yes  yes 
  4 start-stop-count             95    95    40   5571        0xc31500000000 old-age online  yes  yes 
  5 reallocated-sector-count    200   200   140   0 sectors   0x000000000000 prefail online  yes  yes 
  7 seek-error-rate             200   200    51   0           0x000000000000 prefail online  yes  yes 
  9 power-on-hours               80    80     0   1.7 years   0x833900000000 old-age online  n/a  n/a 
 10 spin-retry-count            100   100    51   0           0x000000000000 prefail online  yes  yes 
 11 calibration-retry-count     100   100    51   0           0x000000000000 prefail online  yes  yes 
 12 power-cycle-count            95    95     0   5260        0x8c1400000000 old-age online  n/a  n/a 
194 temperature-celsius-2       108   253     0   35.0 C      0x230000000000 old-age online  n/a  n/a 
196 reallocated-event-count     200   200     0   0           0x000000000000 old-age online  n/a  n/a 
197 current-pending-sector      200   200     0   0 sectors   0x000000000000 old-age online  n/a  n/a 
198 offline-uncorrectable       200   200     0   0 sectors   0x000000000000 old-age online  n/a  n/a 
199 udma-crc-error-count        200   253     0   0           0x000000000000 old-age online  n/a  n/a 
200 multi-zone-error-rate       200   125    51   0           0x000000000000 prefail offline yes  yes 


/org/freedesktop/UDisks2/drives/WDC_WD360GD_00FNA0_WD_WMAH91253983:
  org.freedesktop.UDisks2.Drive:
    Configuration:              {}
    ConnectionBus:              
    Ejectable:                  false
    Id:                         WDC-WD360GD-00FNA0-WD-WMAH91253983
    Media:                      
    MediaAvailable:             true
    MediaChangeDetected:        true
    MediaCompatibility:         
    MediaRemovable:             false
    Model:                      WDC WD360GD-00FNA0
    Optical:                    false
    OpticalBlank:               false
    OpticalNumAudioTracks:      0
    OpticalNumDataTracks:       0
    OpticalNumSessions:         0
    OpticalNumTracks:           0
    Removable:                  false
    Revision:                   35.06K53
    RotationRate:               -1
    Seat:                       seat0
    Serial:                     WD-WMAH91253983
    Size:                       37019566080
    SortKey:                    00coldplug/00fixed/sd____d
    TimeDetected:               1362370394993363
    TimeMediaDetected:          1362370394993363
    Vendor:                     
    WWN:                        
  org.freedesktop.UDisks2.Drive.Ata:
    AamEnabled:                                 true
    AamSupported:                               true
    AamVendorRecommendedValue:                  128
    ApmEnabled:                                 false
    ApmSupported:                               false
    PmEnabled:                                  true
    PmSupported:                                true
    SecurityEnhancedEraseUnitMinutes:           0
    SecurityEraseUnitMinutes:                   0
    SecurityFrozen:                             false
    SmartEnabled:                               true
    SmartFailing:                               false
    SmartNumAttributesFailedInThePast:          -1
    SmartNumAttributesFailing:                  -1
    SmartNumBadSectors:                         1
    SmartPowerOnSeconds:                        0
    SmartSelftestPercentRemaining:              -1
    SmartSelftestStatus:                        
    SmartSupported:                             true
    SmartTemperature:                           0.0
    SmartUpdated:                               0