Mac開啓SSD的TRIM

在Mac OS X 10.9.5 (Mavericks) 上面想用terminal直接開啟非Apple原廠SSD的TRIM功能：

1. 備份原來的driver
   sudo cp /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage-backup
2. 修改driver的內容
   sudo perl -pi -e 's|(^\x00{1,20})[^\x00]{9}(\x00{1,20}\x54)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage
3. 更新系統的快取、讓系統用新的driver
1. sudo kextcache -system-prelinked-kernel
2. sudo kextcache -system-caches
3. sudo touch /System/Library/Extensions/
4. 重新開機後，用指令確認有沒有TRIM support
   system_profiler SPSerialATADataType | grep 'TRIM'

參考文獻

• 《Enable TRIM on non-Apple SSDs in OS X》用指令開啟TRIM
• 《How to check TRIM status via Terminal》檢查TRIM是否有開啟
• 《How to Check and Enable TRIM on a Mac SSD》清楚的圖文說明

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