I bought these drives about 10 years ago, and they've run almost continuously the whole time (I never went down the "HDD standby" rabbithole).
Today's drive is a WD30EFRX-68AX9N0 model, manufactured 27th November 2012 in Malaysia. Total power-on hours at the time of replacement were 85,723.
The reason for the replacement? I got an email from the NAS (running Debian) via 'smartd' with "CurrentPendingSector" in the title yesterday, which occurred during the monthly RAID 5 scrub. Yesterday there were 2 unreadable (pending) sectors. This morning, there are 4. Time for a new drive.
I've now replaced the old drive with one of the newer version EFRX drives (the ones that make more noise ) that I bought to use while developing software in my TS-230. There were no problems during the changeover, and the rebuild is happening now:
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$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sdd1[6] sda1[3] sdb1[5] sdc1[4] sde1[1]
11720536064 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/4] [UU_UU]
[>....................] recovery = 1.1% (34434804/2930134016) finish=2311.3min speed=20879K/sec
bitmap: 17/22 pages [68KB], 65536KB chunk
unused devices: <none>
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$ sudo smartctl --all /dev/sda
smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.10.0-20-amd64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Red
Device Model: WDC WD30EFRX-68AX9N0
Serial Number: WD-WMC1T1500475
LU WWN Device Id: 5 0014ee 6ada798d9
Firmware Version: 80.00A80
User Capacity: 3,000,592,982,016 bytes [3.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2 (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Wed Jan 4 12:02:29 2023 AEST
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: (38880) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
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: ( 390) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x70bd) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 807
3 Spin_Up_Time 0x0027 171 170 021 Pre-fail Always - 6425
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 397
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 001 001 000 Old_age Always - 85723
10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 366
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 74
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 322
194 Temperature_Celsius 0x0022 122 101 000 Old_age Always - 28
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 4
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
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% 20109 -
# 2 Short offline Completed without error 00% 19941 -
# 3 Short offline Completed without error 00% 19773 -
# 4 Short offline Completed without error 00% 19605 -
# 5 Short offline Completed without error 00% 19437 -
# 6 Short offline Completed without error 00% 19270 -
# 7 Short offline Completed without error 00% 19102 -
# 8 Short offline Completed without error 00% 18934 -
# 9 Short offline Completed without error 00% 18766 -
#10 Short offline Completed without error 00% 18598 -
#11 Short offline Completed without error 00% 18431 -
#12 Short offline Completed without error 00% 18263 -
#13 Short offline Completed without error 00% 18095 -
#14 Short offline Completed without error 00% 17927 -
#15 Short offline Completed without error 00% 17759 -
#16 Short offline Completed without error 00% 17591 -
#17 Short offline Completed without error 00% 17424 -
#18 Short offline Completed without error 00% 17256 -
#19 Short offline Completed without error 00% 17088 -
#20 Short offline Completed without error 00% 16920 -
#21 Short offline Completed without error 00% 16752 -
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.