Question used SSD suspiciously low host writes and hours - can S.M.A.R.T attribute be modified by the seller?

Jun 15, 2020
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I bought SM843Tn 480Gb off ebay. It looks pretty beat up and the mfg date is 2015.8. Then Crystal Info says super low <1T writes and only 16 hrs of power time. Am I supposed to believe this? Is there a way sellers modify the SMART data somehow? Some magic commands in Linux maybe?
 
Jun 15, 2020
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holy moly... I guess I am done with buying used SSD's from now on. People can pull end of life SSD from heavy load system and sell as 100% healthy... showing crystal info data.
 
Jun 15, 2020
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here's the data saved from crystal info. (via ancient SATA1 to USB2.0 adapter. The numeric values were same earlier via system primary SATA3 port)
Can you please take a look and give an opinion whether it might have been altered?
Thanks,

----------------------------------------------------------------------------
(2) SAMSUNG MZ7WD480HCGM-00003
----------------------------------------------------------------------------
Enclosure : Disk Name USB Device (V=152D, P=2509, jm1) - sg
Model : SAMSUNG MZ7WD480HCGM-00003
Firmware : DXM9203Q
Serial Number :
Disk Size : 480.1 GB (8.4/137.4/480.1/480.1)
Buffer Size : Unknown
Queue Depth : 32
# of Sectors : 937703088
Rotation Rate : ---- (SSD)
Interface : USB (Serial ATA)
Major Version : ACS-2
Minor Version : ATA8-ACS version 4c
Transfer Mode : SATA/150 | SATA/600
Power On Hours : 14 hours
Power On Count : 12 count
Host Writes : 194 GB
Wear Level Count : 0
Temperature : 30 C (86 F)
Health Status : Good (100 %)
Features : S.M.A.R.T., 48bit LBA, NCQ, TRIM, DevSleep
APM Level : ----
AAM Level : ----
Drive Letter :

-- S.M.A.R.T. --------------------------------------------------------------
ID Cur Wor Thr RawValues(6) Attribute Name
05 100 100 _10 000000000000 Reallocated Sector Count
09 _99 _99 __0 00000000000E Power-on Hours
0C _99 _99 __0 00000000000C Power-on Count
B1 100 100 __5 000000000000 Wear Leveling Count
B3 100 100 _10 000000000000 Used Reserved Block Count (Total)
B4 100 100 _10 000000002641 Unused Reserved Block Count (Total)
B5 100 100 __0 000000000000 Program Fail Count (Total)
B6 100 100 __0 000000000000 Erase Fail Count (Total)
B7 100 100 _10 000000000000 Runtime Bad Block (Total)
B8 100 100 _97 000000000000 Error Detection
BB 100 100 __0 000000000000 Uncorrectable Error Count
BE _70 _52 __0 00000000001E Airflow Temperature
C3 200 200 __0 000000000000 ECC Error Rate
C7 100 100 __0 000000000000 CRC Error Count
CA 100 100 _10 000000000000 SSD Mode Status
EB _99 _99 __0 000000000008 POR Recovery Count
F1 _99 _99 __0 0000184B6D48 Total LBAs Written

-- IDENTIFY_DEVICE ---------------------------------------------------------
0 1 2 3 4 5 6 7 8 9
000: 0040 3FFF C837 0010 0000 0000 003F 0000 0000 0000
010: 5331 4731 4E59 4147 3833 3031 3439 2020 2020 2020
020: 0000 0000 0000 4458 4D39 3230 3351 5341 4D53 554E
030: 4720 4D5A 3757 4434 3830 4843 474D 2D30 3030 3033
040: 2020 2020 2020 2020 2020 2020 2020 8010 4000 2F00
050: 4000 0200 0200 0007 3FFF 0010 003F FC10 00FB B110
060: FFFF 0FFF 0000 0007 0003 0078 0078 0078 0078 4E30
070: 0000 0000 0000 0000 0000 001F 850E 0042 0164 0060
080: 03FC 0039 746B 7D01 4163 7469 BC01 4163 407F 0001
090: 0001 0000 FFFE 0000 0000 0000 0000 0000 0000 0000
100: 36B0 37E4 0000 0000 0000 0008 4000 0000 5002 5385
110: 002D A6B0 0000 0000 0000 0000 0000 0000 0000 401E
120: 401C 0000 0000 0000 0000 0000 0000 0000 0021 0000
130: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
140: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
150: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
160: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001
170: 2020 2020 2020 2020 0000 0000 0000 0000 0000 0000
180: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
190: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
200: 0000 0000 0000 0000 0000 0000 003D 0000 0000 4000
210: 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000
220: 0000 0000 107F 0000 0000 0000 0000 0000 0000 0000
230: 0000 0000 0000 0000 0000 0800 0000 0000 0000 0000
240: 0000 0000 0000 4000 0000 0000 0000 0000 0000 0000
250: 0000 0000 0000 0000 0000 E9A5

-- SMART_READ_DATA ---------------------------------------------------------
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
000: 01 00 05 33 00 64 64 00 00 00 00 00 00 00 09 32
010: 00 63 63 0E 00 00 00 00 00 00 0C 32 00 63 63 0C
020: 00 00 00 00 00 00 B1 13 00 64 64 00 00 00 00 00
030: 00 00 B3 13 00 64 64 00 00 00 00 00 00 00 B4 13
040: 00 64 64 41 26 00 00 00 00 00 B5 32 00 64 64 00
050: 00 00 00 00 00 00 B6 32 00 64 64 00 00 00 00 00
060: 00 00 B7 13 00 64 64 00 00 00 00 00 00 00 B8 33
070: 00 64 64 00 00 00 00 00 00 00 BB 32 00 64 64 00
080: 00 00 00 00 00 00 BE 32 00 46 34 1E 00 00 00 00
090: 00 00 C3 1A 00 C8 C8 00 00 00 00 00 00 00 C7 3E
0A0: 00 64 64 00 00 00 00 00 00 00 CA 33 00 64 64 00
0B0: 00 00 00 00 00 00 EB 12 00 63 63 08 00 00 00 00
0C0: 00 00 F1 32 00 63 63 48 6D 4B 18 00 00 00 00 00
0D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 34 08 00 53
170: 03 00 01 00 02 23 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6C

-- SMART_READ_THRESHOLD ----------------------------------------------------
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
000: 01 00 05 0A 00 00 00 00 00 00 00 00 00 00 09 00
010: 00 00 00 00 00 00 00 00 00 00 0C 00 00 00 00 00
020: 00 00 00 00 00 00 B1 05 00 00 00 00 00 00 00 00
030: 00 00 B3 0A 00 00 00 00 00 00 00 00 00 00 B4 0A
040: 00 00 00 00 00 00 00 00 00 00 B5 00 00 00 00 00
050: 00 00 00 00 00 00 B6 00 00 00 00 00 00 00 00 00
060: 00 00 B7 0A 00 00 00 00 00 00 00 00 00 00 B8 61
070: 00 00 00 00 00 00 00 00 00 00 BB 00 00 00 00 00
080: 00 00 00 00 00 00 BE 00 00 00 00 00 00 00 00 00
090: 00 00 C3 00 00 00 00 00 00 00 00 00 00 00 C7 00
0A0: 00 00 00 00 00 00 00 00 00 00 CA 0A 00 00 00 00
0B0: 00 00 00 00 00 00 EB 00 00 00 00 00 00 00 00 00
0C0: 00 00 F1 00 00 00 00 00 00 00 00 00 00 00 00 00
0D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B2
 
Last edited:

Maxxify

Distinguished
Aug 12, 2007
491
96
19,090
85
The numbers line up with each other, but it looks like the drive was virtually unused. Looks like someone put an OS on it, that OS had trouble with power loss, then they sold it. Absolutely no idea why but that does happen - I don't generally see people going to the trouble of resetting SMART data unless the source is really sketchy (e.g. China). The average user won't have the tools or inclination to do it.
 

USAFRet

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Moderator
Mar 16, 2013
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The numbers line up with each other, but it looks like the drive was virtually unused. Looks like someone put an OS on it, that OS had trouble with power loss, then they sold it. Absolutely no idea why but that does happen - I don't generally see people going to the trouble of resetting SMART data unless the source is really sketchy (e.g. China). The average user won't have the tools or inclination to do it.
Agreed.
It is a used drive. Bought as used. Whether it has 10 hours or 1000 on it...used is used.

I agree with someone bought it, had little or no use for it, and sold it on.

In any case, it will work, right up until the moment it dies.
That may be next week or next decade.
 
Jun 15, 2020
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Thank you for the reply. Do you care to elaborate a bit for me what you meant by "numbers lineup with each other"? I am trying to learn here. Thanks again.
 

USAFRet

Titan
Moderator
Mar 16, 2013
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Thank you for the reply. Do you care to elaborate a bit for me what you meant by "numbers lineup with each other"? I am trying to learn here. Thanks again.
--------------
Power On Hours : 14 hours
Power On Count : 12 count
Host Writes : 194 GB
--------------

It was used for a couple of days, possibly tried to install an OS on it, several reboots later...



For instance, if it had been:
Power On Hours : 2 hours
Power On Count : 135 count
Host Writes : 2 GB
--------------------
That might indicate an issue. So many Power On in such a short time.
 

Maxxify

Distinguished
Aug 12, 2007
491
96
19,090
85
Also these three values:
BE _70 _52 __0 00000000001E Airflow Temperature
EB _99 _99 __0 000000000008 POR Recovery Count
F1 _99 _99 __0 0000184B6D48 Total LBAs Written

Temperature is given from 100, such that 70 would be "30" which in hex is "1E." The worst ever was 52 (48C) which is perfectly reasonable. POR implies power loss count, 8 with how many power-ons the drive lists (12) suggests the person installed an OS and had issues with system stability, likely the reason they stopped using the drive. Total LBAs (sectors) written times 512 (bytes per sector) should match the host writes, which is does.

The reserved block count is ridiculously high by today's standards, but it's an enterprise drive with more than usual overprovisioning and 2D/planar eMLC (enterprise MLC) back then had very small block sizes in comparison. Someone dialing in low/random values would unlikely get these correct (or care to).
 
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The reserved block count is ridiculously high by today's standards, but it's an enterprise drive with more than usual overprovisioning and 2D/planar eMLC (enterprise MLC) back then had very small block sizes in comparison. Someone dialing in low/random values would unlikely get these correct (or care to).
The commercial software tools usually have a single button for resetting the SMART module. This initialises the attributes to their factory defaults. In fact WD HDDs have SMART templates for this purpose. I suspect that SSDs would behave similarly.
 
Jun 15, 2020
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Which means "numbers lining up" does not prove that SMART is not modified by the seller because the factory reset of SMART and accumlating small usage trace will make fake but believable SMART data - am I right?
The seller was advertising his whole batch of used datacenter grade SSD's were all 16hrs or under power hrs. Am I wrong to be suspicious here? Considering how pricy SSD's were back in 2015?
 

USAFRet

Titan
Moderator
Mar 16, 2013
127,949
4,868
159,940
19,905
Which means "numbers lining up" does not prove that SMART is not modified by the seller because the factory reset of SMART and accumlating small usage trace will make fake but believable SMART data - am I right?
The seller was advertising his whole batch of used datacenter grade SSD's were all 16hrs or under power hrs. Am I wrong to be suspicious here? Considering how pricy SSD's were back in 2015?
The only "proven" device is direct from the manufacturer in a factory sealed box.
You bought a used device on fleabay.

It may last a day, it may last a decade. No matter what numbers are presented.
 
Jun 15, 2020
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That is exactly what I learned by posting a question here. I didn't know SMART can be modified by anyone who has the right tool.
 

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