Unrealistic SMART values

[idata]

Hi there,

I bought my Intel 320 SSD in January and use it as my system drive. So, not much writing, I just boot from it. My data is stored elsewhere.

Nevertheless I get these terrifying SMART values:

241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 48989

242 Host_Reads_32MiB 0x0032 100 100 000 Old_age Always - 19852

Does this tell me that 1.53 TiB were written on this drive?! Because that's pretty much impossible. I rarely write anything on it, so the Reads value should be higher than the Writes value (they're both too high, though).

Here are the other values, some of which I'm unable to interpret:

3 Spin_Up_Time 0x0020 100 100 000 Old_age Offline - 0

4 Start_Stop_Count 0x0030 100 100 000 Old_age Offline - 0

5 Reallocated_Sector_Ct 0x0032 100 100 000 Old_age Always - 0

9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 1591

12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 305

170 Reserve_Block_Count 0x0033 100 100 010 Pre-fail Always - 0

171 Program_Fail_Count 0x0032 100 100 000 Old_age Always - 0

172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0

183 Runtime_Bad_Block 0x0030 100 100 000 Old_age Offline - 0

184 End-to-End_Error 0x0032 100 100 090 Old_age Always - 0

187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0

192 Unsafe_Shutdown_Count 0x0032 100 100 000 Old_age Always - 23

199 UDMA_CRC_Error_Count 0x0030 100 100 000 Old_age Offline - 0

225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 48989

226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 34264840

227 Workld_Host_Reads_Perc 0x0032 100 100 000 Old_age Always - 1

228 Workload_Minutes 0x0032 100 100 000 Old_age Always - 2366980413

232 Available_Reservd_Space 0x0033 100 100 010 Pre-fail Always - 0

233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0

What's going on here?

[CFran6]

Intel 320 SSD spec from March 2011 specifies the units of attribute 241 and 242 as "LBAs" but attribute 225 as "32 MiB". This does not make much sense because the raw value of 225 and 241 are apparently always identical. Smartctl test outputs we received on smartmontools-database mailing list suggested that 32 MiB is likely the more reasonable unit. Therefore I decided to use this for the attribute name in the smartmontools drive database. "LBAs" from the spec does not make any sense for your device as 19852 read sectors (less than 10MiB) are probably not enough for a single boot 🙂

This device should also support the new ATA "Device Statistics" feature which is (unlike SMART Attributes) part of the ATA Standard. Please try "smartctl -l devstat ..." and report the result here, in particular the values of "Logical Sectors Read" and "... Written" from "General Statistics" log page. This should give a hint which unit of measure is actually used for the related SMART Attributes.

BTW: The "Workload" related attributes 226-228 need to be cleared before being useful. This could be done with "smartctl -t vendor,0x40 ...", see smartctl man page.

Thanks,

Christian

(smartmontools.org)

[idata]

Hello Christian,

Thank you for your reply, it's nice to instantly get feedback from a smartmontools dev on this issue.

Here's the output:

Device Statistics (GP Log 0x04)

Page Offset Size Value Description

1 ===== = = == General Statistics (rev 2) ==

1 0x008 4 306 Lifetime Power-On Resets

1 0x010 4 1593 Power-on Hours

1 0x018 6 3211855176 Logical Sectors Written

1 0x020 6 117248637 Number of Write Commands

1 0x028 6 1302874550 Logical Sectors Read

1 0x030 6 31953300 Number of Read Commands

4 ===== = = == General Errors Statistics (rev 1) ==

4 0x008 4 0 Number of Reported Uncorrectable Errors

4 0x010 4 0 Resets Between Cmd Acceptance and Completion

6 ===== = = == Transport Statistics (rev 1) ==

6 0x008 4 2093 Number of Hardware Resets

6 0x010 4 3872 Number of ASR Events

6 0x018 4 0 Number of Interface CRC Errors

7 ===== = = == Solid State Device Statistics (rev 1) ==

7 0x008 1 0 Percentage Used Endurance Indicator

I hope it helps.

[idata]

Well, 3211855176 written 512 byte sectors are 1.53 TiB. (With the assumption that a sector in fact has 512 bytes)

[idata]

arcks, Did you try using the Intel SSD Toolbox, and check the SMART data with that?