SSD question

Wawa · 03-31-2021, 01:43 AM

Hello there,

I got a disk problem with my Crucial M4 512 GO SSD.
Suddenly the disk wasn't detected by the bios so no boot etc...
This situation seems to be common with the installed firmware version on the disk (a time bomb in your computer and life is quiet...).
I have recovered the disk with absolutely all the data s by a method found on internet (only power connected for 2 x 30 mn then the drive become visible again by the bios and immediately flash the new firmware).
Then everything become normal !

Now I have check the smart data s of this disk using smartctl :

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ID: 35971

The question is about line 202.
A first reading let think that the disk is 98 % used so near end of life...
But in this case why is the threshold set to 001 ? If the value start from 0 and increase with time this has no sense...
It look to me that "Perc_Rated_Life_Used" value is in fact in the last column : 2 %.

How should I interpret this value ? Is my disk near new or near end of life ?

On my other disk which is more recent 202 parameter value is 100 (but the labeling of the parameter is different "Percent life time remain"), threshold is also 001 and las column is 0.

Thanks for the help. Regards.
Philippe

beachboy2 · 03-31-2021, 07:06 AM

Wawa,

It is confusing but there is nothing to worry about.

The current value of the lifetime remaining is 98%.

The raw value of 2% is what has been used.

Scroll down to SMART ID 202 on:

https://www.micron.com/-/media/clien...attributes.pdf

mrmazda · 03-31-2021, 08:17 AM

Nice to see Crucial provides that information. PNY doesn't:

Code:

# smartctl -x /dev/sda | egrep -A20 'INFORMATION|Data Struct'
=== START OF INFORMATION SECTION ===
Device Model:     PNY CS900 120GB SSD
Serial Number:    PNY...
LU WWN Device Id: 5 f8db4c 041901a4d
Firmware Version: CS900613
User Capacity:    120,034,123,776 bytes [120 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Form Factor:      2.5 inches
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   ACS-4 (minor revision not indicated)
SATA Version is:  SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Mar 31 09:09:13 2021 EDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is:   Unavailable
APM feature is:   Unavailable
Rd look-ahead is: Enabled
Write cache is:   Enabled
DSN feature is:   Unavailable
ATA Security is:  Disabled, frozen [SEC2]
--
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     PO-R--   100   100   050    -    0
  9 Power_On_Hours          -O--C-   100   100   000    -    6050
 12 Power_Cycle_Count       -O--C-   100   100   000    -    34
168 Unknown_Attribute       -O--C-   100   100   000    -    0
170 Unknown_Attribute       PO----   100   100   000    -    61
173 Unknown_Attribute       -O--C-   100   100   000    -    524308
192 Power-Off_Retract_Count -O--C-   100   100   000    -    8
194 Temperature_Celsius     PO---K   067   067   000    -    33 (Min/Max 33/33)
218 Unknown_Attribute       PO-R--   100   100   050    -    0
231 Temperature_Celsius     PO--C-   100   100   000    -    99
241 Total_LBAs_Written      -O--C-   100   100   000    -    447
                            ||||||_ K auto-keep
                            |||||__ C event count
                            ||||___ R error rate
                            |||____ S speed/performance
                            ||_____ O updated online
                            |______ P prefailure warning
# smartctl -x /dev/sda | egrep -A3 'tended Sel'
SMART Extended Self-test Log Version: 1 (1 sectors)
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%      6048         -
# 2  Short offline       Completed without error       00%      6044         -

Wawa · 03-31-2021, 02:06 PM

Thanks a lot for the clarification !

Regards.
Philippe