help with reading drive smart data

[xxccxx]

i have a wd drive that recently failed (wd5000-aakb-pcb-failure-t18208.html)
and i started to look at the smart data of my other wd drive that is still working (WD5000 AAkb)
i have look at the smart data from three different programs and they all report back different things

according to everest

[ WDC WD5000AAKB-00H8A0 (WD-WCASY8646587) ]

01 Raw Read Error Rate 51 200 200 1 OK: Value is normal
03 Spinup Time 21 161 158 4916 OK: Value is normal
04 Start/Stop Count 0 99 99 1592 OK: Always passes
05 Reallocated Sector Count 140 200 200 0 OK: Value is normal
07 Seek Error Rate 0 100 253 0 OK: Always passes
09 Power-On Time Count 0 98 98 2081 OK: Always passes
0A Spinup Retry Count 0 100 100 0 OK: Always passes
0B Calibration Retry Count 0 100 100 0 OK: Always passes
0C Power Cycle Count 0 99 99 1588 OK: Always passes
C0 Power-Off Retract Count 0 200 200 378 OK: Always passes
C1 Load/Unload Cycle Count 0 200 200 1592 OK: Always passes
C2 Temperature 0 117 97 30 OK: Always passes
C4 Reallocation Event Count 0 200 200 0 OK: Always passes
C5 Current Pending Sector Count 0 200 200 0 OK: Always passes
C6 Offline Uncorrectable Sector Count 0 200 200 0 OK: Always passes
C7 Ultra ATA CRC Error Rate 0 200 200 9 OK: Always passes
C8 Write Error Rate 0 200 200 0 OK: Always passes

according to pc wizard

SMART Information Disk WDC WD5000AAKB-00H8A0 :
Health : 99% (estimated)
Performance : 99% (estimated)
Reallocated Sectors : 0
Pending Sectors : 0
Uncorrectable Sectors : 0
Total Boot : 1588 x
PowerOn Count : 2081 hours
Failure Prediction Supported : No

Raw Read Error Rate (01) : 00001 (Threshold : 051 - Worst : 200 - Max : 200)
Spin Up Time (03) : 01334 (Threshold : 021 - Worst : 158 - Max : 161)
Start/Stop Count (04) : 00638 (Threshold : 000 - Worst : 099 - Max : 099)
Reallocated Sector Count (05) : 00000 (Threshold : 140 - Worst : 200 - Max : 200)
Seek Error Rate (07) : 00000 (Threshold : 000 - Worst : 253 - Max : 100)
Power On Hours Count (09) : 00821 (Threshold : 000 - Worst : 098 - Max : 098)
Spin Retry Count (0A) : 00000 (Threshold : 000 - Worst : 100 - Max : 100)
Calibration Retry Count (0B) : 00000 (Threshold : 000 - Worst : 100 - Max : 100)
Power Cycle Count (0C) : 00634 (Threshold : 000 - Worst : 099 - Max : 099)
Power-Off Retract Count (C0) : 0017A (Threshold : 000 - Worst : 200 - Max : 200)
Load/Unload Cycle Count (C1) : 00638 (Threshold : 000 - Worst : 200 - Max : 200)
Temperature (C2) : 0001E (Threshold : 000 - Worst : 097 - Max : 117)
Reallocation Event Count (C4) : 00000 (Threshold : 000 - Worst : 200 - Max : 200)
Current Pending Sector Count (C5) : 00000 (Threshold : 000 - Worst : 200 - Max : 200)
Off-Line Uncorrectable Sector Cou... 00000 (Threshold : 000 - Worst : 200 - Max : 200)
Ultra ATA CRC Error Rate (C7) : 00009 (Threshold : 000 - Worst : 200 - Max : 200)
Write Error Rate (C8) : 00000 (Threshold : 000 - Worst : 200 - Max : 200)

acording to wd lifegaurd

cant paste it ???

[drc]

Hex vs dec

[fzabkar]

03 Spinup Time ... 4916

Spin Up Time (03) : 01334 ...

You can use Google's calculator to convert between decimal and hexadecimal, eg ...

http://www.google.com/search?q=4916+in+hexadecimal

[xxccxx]

yes but are these numbers okay bad
or are they just irrelevant to a drives health

[guru]

Attributes that use the Pre-Failure/Advisory Bit Set can predict potential future degrading or
faulty conditions. Attributes with the Failure/Advisory Bit Clear are used for informational
purposes only, they do not indicate impending drive failure.


Read Error Rate 1 Pre-Failure
Spin-up Time 3 Pre-Failure
Start/Stop Count 4 Advisory
Re-allocated Sector Count 5 Pre-Failure
Seek Error Rate 7 Pre-Failure
Power-on Hours Count 9 Advisory
Spin-up Retry Count 10 Pre-Failure
Drive Calibration Retry Count 11 Advisory
Drive Power Cycle Count 12 Advisory
Emergency Retract Cycles 192 Advisory
Load/Unload Cycles 193 Advisory
HDA Temperature2 194 Advisory
Relocation Event Count 196 Advisory
Current Pending Sector Count 197 Advisory
Offline Scan Uncorrectable Sector Count 198 Advisory
Ultra ATA CRC Error Rate 199 Advisory
Multi-zone Error Rate 200 Pre-Failure

[Vulcan]

are they just irrelevant to a drives health

None of the numbers are irrelevant to drive health, otherwise the drive [and the SMART spec] wouldn't bother recording them Some parameters have a more direct link to liklihood of imminent drive failure than others, as guru has mentioned.

are these numbers okay

While it would be possible to go through each value and make comments, the short version is that IMHO everything related to the drive itself looks OK currently.

But be aware - SMART does not predict every failure; only some, slowly degrading failure modes trigger the SMART thresholds and give you enough warning to do something about it. From various studies IIRC less than 20% of drive failures (and sometimes much less than that) were predicted with enough time to take any action (e.g. enough warning for a RAID system to clone that drive before failure). That sort of prediction rate fits with my experience too - you can't rely on waiting for SMART to tell you about a drive problem, before the drive fails; it just gives useful warning in some cases.

[fzabkar]

yes but are these numbers okay bad
or are they just irrelevant to a drives health

The following article explains the meaning of each attribute:
http://en.wikipedia.org/wiki/S.M.A.R.T.