SSD wear_leveling_count firmware bug?
Hi,
I have two identical late 2013 27" iMacs with 256GB Samsung SSDS.
Both insist that the SSD will be EOL soon, Windows and Disk Utility complain about SMART errors:
smartctl -a /dev/disk0
173 Wear_Leveling_Count 0x0036 087 087 100 Old_age Always FAILING_NOW 13031154781293
- Win 7 in Bootcamp warned about the SMART error
- Disk Utility in OS X suggests to replace the SSD
- Wear Level Count is allegedly depleted although not that much data has actually been written to the drive (11 TiB)
- all other SMART values/tests show no problem
Here's a link with more technical details suggesting there may be a bug in the firmware:
https://forum.hddguru.com/viewtopic.php?f=10&t=31501&mobile=mobile
The first one started reporting the failure a few months ago and has been working fine ever since. The second one just reporting the issue two weeks ago.
I have several other Macs (Macbook Air x2, MacBook Pro) where no such problem is showing.
Does anyone have the same problem? Since Disk Utility does not actively notify about the issue I think others may have this problem, too without knowing.
Here's one smartctl report from the more worn out iMac:
smartctl 6.3 2014-07-26 r3976 [x86_64-apple-darwin14.3.0] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Apple SD/SM/TS...E/F SSDs
Device Model: APPLE SSD SM0256F
Serial Number: S18WNYAD617995
LU WWN Device Id: 5 002538 655584d30
Firmware Version: UXM2EA1Q
User Capacity: 251,000,193,024 bytes [251 GB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: Solid State Device
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS T13/1699-D revision 4c
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Mon Apr 25 15:46:47 2016 CEST
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: FAILED!
Drive failure expected in less than 24 hours. SAVE ALL DATA.
No failed Attributes found.
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 16) The self-test routine was aborted by
the host.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x5f) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Abort Offline collection upon new
command.
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: ( 10) minutes.
SMART Attributes Data Structure revision number: 40
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x001a 200 200 000 Old_age Always - 0
5 Reallocated_Sector_Ct 0x0033 100 100 000 Pre-fail Always - 0
9 Power_On_Hours 0x0032 097 097 000 Old_age Always - 12947
12 Power_Cycle_Count 0x0032 096 096 000 Old_age Always - 3633
169 Unknown_Attribute 0x0013 253 253 010 Pre-fail Always - 2375460851456
173 Wear_Leveling_Count 0x0036 087 087 100 Old_age Always FAILING_NOW 13031154781293
174 Host_Reads_MiB 0x0022 099 099 000 Old_age Always - 17198560
175 Host_Writes_MiB 0x0022 099 099 000 Old_age Always - 11704663
192 Power-Off_Retract_Count 0x0012 099 099 000 Old_age Always - 79
194 Temperature_Celsius 0x0022 055 055 000 Old_age Always - 45 (Min/Max 12/79)
197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 0
199 UDMA_CRC_Error_Count 0x001a 200 200 000 Old_age Always - 0
240 Unknown_SSD_Attribute 0x0022 100 100 000 Old_age Always - 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 Aborted by host 00% 7 -
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.
If anyone from Apple's reading this: Could you forward this thread to an Engineer?
Thanks,
Johannes
iMac (27-inch, Late 2013), OS X Yosemite (10.10.5)