Hello
I need a little help with HDS721050CLA660 SMART.

When i use MHDD, i see relocated sectors count raw value is 2228258.
But when i use hddscan, i see raw value is 00000022-0022.

In all FAQ's that i have read, i saw only "The raw value normally represents a count of the bad sectors that have been found and remapped".

I understand, 2228258d=220022h, but the surface is pretty good, and HDD is almost new. Is there realy 2228258d relocated sectors? Or i just dont understand something important about SMART?

Help me, please, how should i understand this values?

How exactly do you define "pretty good"? Do you trust a drive which is "pretty good"? If it is your drive and your data, then it is your choice what you trust - but you might want to research the results of the Google data centre survey, and their conclusions about the SMART reallocated sectors attribute on the drives in their survey.


No - I expect that this drive has has 22 hex (34 decimal) reallocated sectors, due to the slightly-unusual-but-allowed-by-the-specification representation which these drives use to report the raw value. If you provide the full SMART attribute data (including raw values), then there may be some other evidence to help confirm (or deny) my expectation above.


The decoding varies between different SMART attributes and between drive makes/models.

I didn't know about this survey. Very useful information, just what i needed. Thanks alot.
Ofcourse i dont trust in this hdd anymore, it is not a question I just want to learn more about SMART.



Num Attribute Name Value Worst Raw(hex) Threshold
001 Raw Read Error Rate 100 081 00000000-0000 016
002 Throughput performance 136 100 00000000-005F 054
003 Spin Up Time 115 100 000300C7-00C8 024
004 Start/Stop Count 100 100 00000000-0018 000
005 Reallocation Sector Count 100 100 00000022-0022 005
007 Seek Error Rate 100 100 00000000-0000 067
008 Seek time Perfomance 140 100 00000000-001E 020
009 PowerOn Hours Count 100 100 00000000-0009 000
010 Spin Retry Count 100 100 00000000-0000 060
012 Device Power Cycle Count 100 100 00000000-0018 000
183 SATA Downshift Error Count 100 100 00000000-0000 000
184 End To End Error Count 100 100 00000000-0000 097
185 Head Stability 100 100 00000000-071A 000
187 Reported Uncorrectable Error 100 100 00000000-0000 000
188 Reported Command Timeouts 100 099 00000000-04B3 000
189 High Fly Writes 100 100 00000000-0000 000
190 Airflow Temperature 066 060 34 C 000
190 Airflow Temperature Minimum 066 060 34 C 000
190 Airflow Temperature Maximum 066 060 33 C 000
192 Emergency Retract Count 100 100 00000000-0018 000
193 Load/unload Cycle Count 100 100 00000000-0018 000
194 HDA Temperature 176 150 34 C 000
194 HDA Temperature Minimum 176 150 14 C 000
194 HDA Temperature Maximum 176 150 40 C 000
196 Reallocation Event Count 100 100 00000000-0022 000
197 Current Pending Sector Count 100 100 00000000-004E 000
198 Uncorrectable Sector Count 100 100 00000000-000B 000
199 UltraDMA CRC Errors 200 200 00000000-0000 000

i see: "196 Reallocation Event Count 100 100 00000000-0022 000".
So... 2228258 is just the unusual representation of 22h reallocated sectors, right?

Thanks for that data.

Yes - but be careful. The value of SMART attribute #196 is not always the same as the "real" value of SMART attribute #5. There can be reasons for these 2 values to be different, but this is the data I wanted, in order to do a basic "sanity check" that 22h reallocated sectors was probably the correct interpretation of SMART attribute #5.

Looking at the other SMART data e.g. attributes #197 and #188, this confirms my concern that the drive is having problems. As you say, this appears to be a new drive (power-on hours count = 9) unless someone cleared all previous SMART data before you got the drive. I guess your next steps depend on where you got the drive, what guarantee/warranty you have, and how much you trust the seller not to have tampered with the SMART data to make the drive appear to be new. Of course you can look at the dates on the drive label (although I have seen forged labels), or use the HGST warranty check website here, to try to confirm whether this is really a "new" drive:

http://www.hgst.com/warranty/index_serial.do

Unfortunately, I do not see evidence of a SMART "threshold exceeded" situation - that is what most people call a "SMART failure". In other words, the drive is not perfect, but some (most? all?) manufacturers would likely say that this drive is currently not faulty enough for them to agree to replace it under warranty. This is (in my experience) a horrible grey area. Assuming that you don't need the data on the drive, one thing you could do is to download & run the HGST DFT tool, to test the drive:

http://www.hgst.com/warranty/jsp/arma22h.jsp

If that DFT testing fails, then that gives you good evidence to try to get a replacement drive (if that drive is shown as non-OEM and within warranty, using the warranty check tool). Unfortunately if the thresholds used by DFT mean that it reports a "pass", then you are in the grey area that I mentioned.

Good luck!

Thanks alot for all this information, Vulcan

You're welcome - good luck!