HOW TO: YOSEMITE and restore to original

We will boot from recovery partition with cmd + r at startup, then manually in terminal:

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and

and

NB*
an encrypted volume (FileVault) must before be unlocked and mounted with the Disk Utility, available in the recovery volume, otherwise it will not appear in /Volumes/

NB**
If your disk name is spelled in two words like <Your Disk>, then the bash syntax would be: Your\ Disk or 'Your Disk' If it is <YourDisk> in a single word then it is simply YourDisk.

HOW TO: YOSEMITE and kext sign control

If you encounter a block sign on boot after appling patch for trim try this way to force disable kext sign:
boot from recovery with cmd + r at startup, then manually in terminal:

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HOW TO: enabling Trim on OSX 10.10.4

Apple finally opened to allows users to enable TRIM functionality on third-party, the trimforce command must be entered into Terminal

"sudo trimforce enable"

HOW TO: enabling Trim on OSX 10.9 and 10.8

Copy and paste the code snippets through the terminal window (Applications->Utilities->terminal).

Backup the file we're patching

Patch the file to enable TRIM support for any SSDs (from 10.9.4 to 10.9.5)

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

Patch the file to enable TRIM support for any SSDs (from 10.8.3 to 10.9.3)

sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\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

or patch the file for 10.7.5 to 10.8.2

sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00{1,20})[^\x00]{9}(\x00{1,20}\x4D)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage

Finalize the patch:

sudo kextcache -system-prelinked-kernel

sudo kextcache -system-caches

sudo touch /System/Library/Extensions/

Now reboot your system and verify that TRIM is enabled through the System Information.

HOW TO: enabling Trim manually in OSX 10.6.8

Copy and paste the code snippets through the terminal window (Applications->Utilities->terminal).

Backup the file we're patching

Patch the file to enable TRIM support for any SSDs

"sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00{1,20})[^\x00]{9}(\x00{1,20}\x51)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage"

flush the kext caches

"sudo kextcache -system-prelinked-kernel"

"sudo kextcache -system-caches"

Now reboot your system and verify that TRIM is enabled through the System Information.

If you want to disable TRIM support

"sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00).{9}(\x00\x51)|$1\x41\x50\x50\x4C\x45\x20\x53\x53\x44$2|sg' /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage"
"sudo kextcache -system-prelinked-kernel"
"sudo kextcache -system-caches"

If you want restore the backup

"sudo cp /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage.backup /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage"

HOW TO: set/unset SMS in OSX

In the terminal window

to check status:

"sudo pmset -g"

if return 1 is enabled, if return 0 is disabled

to disable:

"sudo pmset -a sms 0"

to re-enable:

"sudo pmset -a sms 1"

HOW TO: set NOATIME

In the terminal window

"cd Library"

"cd LaunchDaemons"

"sudo pico com.ssd.noatime.plist"

then paste this:

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>com.noatime.root</string> <key>ProgramArguments</key> <array> <string>mount</string> <string>-uwo</string> <string>noatime</string> <string>/</string> </array> <key>RunAtLoad</key> <true/> </dict> </plist>

now save and reboot

to check

mount | grep " / "

you should see something like "/dev/disk0s2 on / (hfs, local, journaled, noatime)"

to restore with no-noatime delete the file created at /Library/LaunchDaemons