Help decoding SMART data


I have been having some weird effects with my relatively new WD Green 3Tb(bought in December 2012). Just sometimes reading from it stalled and my computer could not read anyjthing from it for minutes. After a reboot it could not be detected.  It might be during overheat because it was installed in front of 15k SAS Seagate drive, the hot air from which used to pass through my WD, probably. However, when I run smartmontools (I use Linux), the temperature was around 40C. Anyways, I saved data, reinstalled the drive into different bay (now WDC warms Seagate!), reformatted it and started to use it again. I have got the following SMART data

grishin@volki:~$ sudo smartctl /dev/sda -a
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-4-amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen,

Device Model: WDC WD30EZRX-00MMMB0
Serial Number: WD-[Deleted]
LU WWN Device Id: 5 0014ee 2b20a49d9
Firmware Version: 80.00A80
User Capacity: 3,000,592,982,016 bytes [3.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Wed Jun 19 13:03:45 2013 MDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
                                        was completed without error.
                                        Auto Offline Data Collection: Enabled.
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: (50280) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        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: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 255) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x3035) SCT Status supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
  1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
  3 Spin_Up_Time 0x0027 141 137 021 Pre-fail Always - 9908
  4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 246
  5 Reallocated_Sector_Ct 0x0033 193 193 140 Pre-fail Always - 101
  7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0
  9 Power_On_Hours 0x0032 098 098 000 Old_age Always - 2155
 10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0
 11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0
 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 246
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 190
193 Load_Cycle_Count 0x0032 196 196 000 Old_age Always - 14586
194 Temperature_Celsius 0x0022 120 099 000 Old_age Always - 32
196 Reallocated_Event_Count 0x0032 138 138 000 Old_age Always - 62
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 1
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 2
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 2

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 0 -

SMART Selective self-test log data structure revision number 1
    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.


Any smart SMART experts? I am a SMART-peasant, know only temperature parameter and seek-err-rate. Is the drive doing OK now?




Perhaps you will need to reach WD for more information, however is my understating that the internal can go up to 55 C and not problem should be presented.

To Contact WD for Technical Support

could you please install hard disk sentinel and see the summary ?

yeah 40ºc is a good temperature… i had one WD5000AAKS that survived well with no bad sectors for three months in temperatures between 55 ºc and 59 ºc

when i discovered i removed the drive from the setup box :confused:

I got a few 160GB RE1 and 1TB RE3 and intended for 24/7 usage. These are server grade drives (often just rebadged caviar blacks afaik). Here are my finding on their performance:

The RE3 1TB hdds get much warmer than the RE1 160GB drives. Do not go above 50°C if possible. anything below 45°C is totally fine. I once hit pretty high temps in summer (no hdd cooling) and they turned themselves off (should occur at ~53-60°C for these models). If you should still reach these high temperatures values, a cheap and slow fan should already suffice to cool that drive. A small airflow around the drive is plenty, unless your room temperature is already at 40°C or above.

Now, as for your SMART data on that caviar green:

caviar green is probably the cheapest and most unreliable WD drive next to AV-GP drives. It is a pity that we dont get quality for less, but, well, thats what it is.

Keep an eye on that reallocated sector count. If the number increases more within a short timeframe,  that drive is dying and you should get a replacement asap and secure the data. If it is stuck on that value after 1 month, it should still be good for a bit longer. but keep your eye on it :slight_smile:

You have a power on time of about 90 days and over 100 reallocated sectors. In comparison, my 1TB drives should have a power on time of a little over 2 years, yet without any reallocated sectors. the older 160GB drives have none either and are way past the 3.5 year mark