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HDD new? SMART Power Off Retract Count and Load Cycle Count
http://forum.hddguru.com/viewtopic.php?f=7&t=29551		 Page 1 of 1
Author:  BlueDragon [ September 17th, 2014, 11:43 ]
Post subject:  HDD new? SMART Power Off Retract Count and Load Cycle Count
Hi,
I just received my new (?) HDD in an open antistatic bag with following SMART attributes:
Code:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   100   253   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   100   253   021    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       3
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   100   253   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       0
10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       3
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       1
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       1
194 Temperature_Celsius     0x0022   117   117   000    Old_age   Always       -       30
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   100   253   000    Old_age   Offline      -       0

I'm a bit puzzled about the interpretation of these values... I understand the spindle has started to rotate 3 times (SMART attribute #4) which is in line with the power cycle count of 3 (SMART attribute #12). Now what about this 'Power Off Retract Count' (SMART attribute #192) and the 'Load Cycle Count' (SMART attribute # 193) of both being only 1?

Goggling around I found many quite contradictory explanations about these 2 latter attributes...
#192:
Wikipedia: "Count of times the heads are loaded off the media. Heads can be unloaded without actually powering off."
HD Sentinel: "Count of power off cycles"
Both these information are logically not fitting together. And in this SMART example above clearly the the drive has been powered up/down 3 times but power off retract count is only 1. How can that be?
#193:
Wikipedia: "Count of load/unload cycles into head landing zone position."
HD Sentinel: "Count of load/unload cycles"
How can the drive in this example above has been power cycled 3 times and the head unloaded only 1 time??

In any case this HDD is not totally new, since it has been power cycled at least 2 times before I connected it. Not a big problem at all I guess but still a bit unpleasant given the fact that the manufacturing date is Jan 2014 and I just received it today. Like I'm used to do I will start a surface scan before I will fill it with data.

BTW what would you guys advise to check / test basically before starting to use a new (?) drive? Simple surface read scan or filling it with zeros or more?

Thanks for your answers!
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