id summary reporter owner description type status priority milestone component version resolution keywords cc 615 Apple TS0256F shows spurious FAILING_NOW results Chris Ferebee "I have a 256 GB SSD in my 2014 11"" MacBook Air, OS X 10.11.0. I believe the TS0256F is manufactured by Toshiba, while many MacBooks use an SM0256F manufactured by Samsung. Almost all parameters are listed as FAILING_NOW, but the SSD appears to function normally in every way. For example, when the MacBook is idle, temperature is reported as 32 (see below), and with the SSD under heavy continuous write load the temperature parameter will go up to 82. Read and write speeds are as expected, around 550/450 MB/s. I understand that attribute 173 (Wear_Leveling_Count) starts at 200 and counts down, triggering an error when it reaches 100. It's currently at 197, which I take as confirmation that the drive has not been overused. Is this just a cosmetic bug? {{{ # smartctl -a /dev/disk0 smartctl 6.4 2015-06-04 r4109 [x86_64-apple-darwin15.0.0] (local build) Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Apple SD/SM/TS...E/F SSDs Device Model: APPLE SSD TS0256F Serial Number: 34GSxxxxxxxx Firmware Version: 109R0219 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 6 SATA Version is: SATA 3.0, 6.0 Gb/s (current: >6.0 Gb/s (4)) Local Time is: Sat Oct 10 16:13:56 2015 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: PASSED See vendor-specific Attribute list for marginal Attributes. General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Total time to complete Offline data collection: ( 0) seconds. Offline data collection capabilities: (0x00) Offline data collection not supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x00) Error logging NOT supported. No General Purpose Logging support. 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 0x0000 000 100 100 Old_age Offline FAILING_NOW 0 5 Reallocated_Sector_Ct 0x0000 000 100 100 Old_age Offline FAILING_NOW 0 9 Power_On_Hours 0x0000 000 100 100 Old_age Offline FAILING_NOW 144 12 Power_Cycle_Count 0x0000 000 100 100 Old_age Offline FAILING_NOW 3360 169 Unknown_Attribute 0x0008 100 100 010 Old_age Offline - 1851873300992 173 Wear_Leveling_Count 0x0010 197 197 100 Old_age Offline - 77315768372 192 Power-Off_Retract_Count 0x0000 000 100 100 Old_age Offline FAILING_NOW 20 194 Temperature_Celsius 0x0000 068 100 100 Old_age Offline FAILING_NOW 32 (Min/Max 18/83) 197 Current_Pending_Sector 0x0000 100 100 100 Old_age Offline FAILING_NOW 0 199 UDMA_CRC_Error_Count 0x0000 000 100 100 Old_age Offline FAILING_NOW 0 174 Host_Reads_MiB 0x0000 015 100 100 Old_age Offline FAILING_NOW 24191827 175 Host_Writes_MiB 0x0000 021 100 100 Old_age Offline FAILING_NOW 3980335 151 Unknown_Attribute 0x0086 000 000 --- Old_age Always - 0 SMART Error Log not supported SMART Self-test Log not supported Selective Self-tests/Logging not supported }}}" defect closed minor smartctl wontfix