I have an SSD that has been running for years. It was part of a RAID0 that failed. The other SSD in the array was definitely bad - it doesn't show up at all when I plug it into a computer anymore. I'm trying to figure out if this SSD that I'm dealing with is also bad.
An extended SMART test with the disks utility in Linux tells me that "Disk is OK". When I run badblocks on it with sudo badblocks -w -s -v /dev/sdc, and leave it running overnight, I had a huge list of errors. It didn't complete by morning, and I had to interrupt it, but it was somewhere around this stage: one, 20:19:28 elapsed. (0/13/5396172 errors).
I guess what I'm wondering is: if there are this many errors that badblocks is running into, how is SMART not seeing them? Is my SSD bad or not?
The results of my SMART test are below:
$ sudo smartctl -a /dev/sdc
[sudo] password for tal:
smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.6.13-200.fc31.x86_64] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Samsung based SSDs
Device Model: Samsung SSD 840 EVO 250GB
Serial Number: S1DBNSAD968844W
LU WWN Device Id: 5 002538 8a0021de5
Firmware Version: EXT0DB6Q
User Capacity: 250,059,350,016 bytes [250 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Fri Jul 3 08:15:18 2020 MDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 4800) seconds.
Offline data collection
capabilities: (0x53) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 80) minutes.
SCT capabilities: (0x003d) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
9 Power_On_Hours 0x0032 089 089 000 Old_age Always - 53840
12 Power_Cycle_Count 0x0032 099 099 000 Old_age Always - 976
177 Wear_Leveling_Count 0x0013 094 094 000 Pre-fail Always - 65
179 Used_Rsvd_Blk_Cnt_Tot 0x0013 100 100 010 Pre-fail Always - 0
181 Program_Fail_Cnt_Total 0x0032 100 100 010 Old_age Always - 0
182 Erase_Fail_Count_Total 0x0032 100 100 010 Old_age Always - 0
183 Runtime_Bad_Block 0x0013 100 100 010 Pre-fail Always - 0
187 Uncorrectable_Error_Cnt 0x0032 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0032 062 047 000 Old_age Always - 38
195 ECC_Error_Rate 0x001a 200 200 000 Old_age Always - 0
199 CRC_Error_Count 0x003e 001 001 000 Old_age Always - 3718773
235 POR_Recovery_Count 0x0012 099 099 000 Old_age Always - 183
241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always - 22842562290
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 0 -
# 2 Extended offline Completed without error 00% 0 -
# 3 Short offline Completed without error 00% 0 -
# 4 Short offline Completed without error 00% 212 -
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
