可以用Smartontools查看Mac的磁盘信息，下面使用port安装此工具。
$ sudo port install smartmontools
查看SSD磁盘寿命情况，一般查看的是'Wear_Leveling_Count'，初始值应该是200，当这个值接近100时，就要考虑更换硬盘了。普通SSD在写入100T后是将逐渐会出现问题。
$ smartctl -a /dev/disk0 smartctl 6.4 2015-06-04 r4109 [x86_64-apple-darwin15.3.0] (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 SM256E Serial Number: S0X5NYBC737708 LU WWN Device Id: 5 002538 043584d30 Firmware Version: CXM09A1Q 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 Aug 29 11:05:08 2016 CST 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: (0x02) Offline data collection activity was completed without error. 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: ( 960) seconds. Offline data collection capabilities: (0x5b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend 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: ( 16) minutes. 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 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 099 099 000 Old_age Always - 4547 12 Power_Cycle_Count 0x0032 094 094 000 Old_age Always - 5464 169 Unknown_Attribute 0x0013 253 253 010 Pre-fail Always - 1873134229760 173 Wear_Leveling_Count 0x0032 190 190 100 Old_age Always - 90214170749 192 Power-Off_Retract_Count 0x0012 099 099 000 Old_age Always - 3873 194 Temperature_Celsius 0x0022 057 027 000 Old_age Always - 43 (Min/Max 9/73) 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 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] 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.