Apple Operating Systems and Devices
Enabling TRIM for third-party SSDs is primarily done through the trimforce command in Terminal. Here’s a breakdown of the process and important considerations:
Understanding TRIM
Enabling TRIM
trimforce command is the native way to enable TRIM in macOS High Sierra and later versions.sudo mdutil -i off /Volumes/YourExternalDriveName
Explanation:
sudo: This command requires administrator privileges to modify system settings.mdutil: This is the command-line utility for managing the Metadata Server, which handles Spotlight indexing.-i off: This option tells mdutil to turn off indexing./Volumes/YourExternalDriveName: This is the path to your external drive. You must replace “YourExternalDriveName” with the actual name of your drive as it appears in the Finder or in the /Volumes directory.Use the power of rsync to ensure file creation dates are preserved whilst copying and the ability to restart if interrupted and automatically skip files which have already been copied
MacOS does come with a version of rsync pre-installed. However, this is normally an ancient version and needs the newer version installed to get the latest features, e.g. preserve creation times option or bug fixes. Here’s how you can typically achieve this on MacOS:
https://remotedesktop.google.com
In Finder to display of Hidden files by type Cmd + Shift + . (dot)
To turn on globally type the following command in Terminal:
defaults write com.apple.finder AppleShowAllFiles -bool true
To revert back to hidden append false:
defaults write com.apple.finder AppleShowAllFiles -bool false
To make the Finder change effective type:
killall Finder
If when installing an HP 7520 WiFi printer with HP Easy Start you get a warning that the scanner does not support “Bonjour” then you may end up with a working printer but no scanner!
In most cases this happens because you have a dual band router advertising 2.4GHz and 5GHz on the same SSIDs. In short the HP 7420 only works with the 2.4GHz network.
One solution is to disable the 5GHz network or rename it and only connect the Mac and printer to the 2.4GHz SSID network.
Fit a YouTube video in the browser window as follows:
Normal YouTube Video URL is https://www.youtube.com/watch?v=grItaOxuyTE&t
To watch in a re-sizable window without switching to Full Screen rewrite the above URLas follows:
https://www.youtube.com/v/grItaOxuyTE&t
Append your YouTube video ID to www.youtube.com/v/VIDEO_ID to display a re-sizeable browser window.
In other words replace /watch?v= with /v/ in the normal URL
The steps below are for Catalina but it should be the same for other versions of macOS.
Check hard disk Integrity to rule out disk faults
Boot the computer up in single user terminal. On chime press Command + S and run file system checker and repair
/sbin/fsck -fy
Reboot as follows:
/sbin/mount -uw / reboot
Repair Permissions
Open Disk Utility and choose your main hard drive from the sidebar (in most Macs there will only be one.) Now click on First Aid and Repair Permissions.