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Windows and OS X ignore this bit because as of now, they only support 'normal' sequential TRIM, so is unaffected BY THIS ONE PARTICULAR PROBLEM. The incorrect bit says that EVO supports beyond normal sequential queued TRIM commands (it does not) and then Linux attempts to implement (which does support more than sequential) and runs in to problems. One problem, related to the drives having an incorrect bit set that tells the OS what type of NCQ queing command it supports. Not true, there are actually TWO critical issues discovered so far with the EVO drives, one Linux related, the other NOT. Some users are insisting the problem is only with Linux, and you don't need a firmware update. There is a lot of confusion about the multiple issues with the Samsung and the need for firmware update. In some entries, terminal indicated error, but when restarting and checking I was left with TRIM activated.IF YOU OWN A SAMSUNG EVO OR EVO PRO, 840 OR 850, be sure to install the latest firmware before turning on TRIM support

Sudo perl -pi -e 's|(\x52\圆F\x74\圆1\x74\圆9\圆F\圆E\圆1\圆C\x00\x4D)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorageģ° Run these commands in succession to clear the system caches to enable OS X to pick up the modified 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-backupĢ° Modify the driver (choose only one of the following lines, based on the version) for 10.7.5, 10.8.1, 10.8.2: Activar TRIM con Terminal en Mac OS Lion 10.7.5