Note : You will need an active Internet connection. Reinstall Lion, Mountain Lion, or Mavericks When the process is completed, then quit DU and return to the main menu. If no errors are reported then click on the Repair Permissions button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. It has presets such as snapping to either side, top and bottom halves, corners, thirds, etc. Unlike the native solution, Rectangle lets you snap windows by using a keyboard shortcut.
#Max os x split screen free
If it does not say "Verified" then the hard drive is failing or failed. Rectangle is a free and open-source app that allows you to quickly snap your active windows on macOS. In the DU status area you will see an entry for the S.M.A.R.T. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.
When the recovery menu appears select Disk Utility. Select the Recovery HD and click on the downward pointing arrow button. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Reinstall Lion, Mountain Lion, or Mavericks without erasing drive Most likely you will need to reinstall OS X: OS X Mountain Lion- If you see a blue screen at startup