mavericks

It never hurts to have a bootable disk/USB flash drive to repair a Mac or install OS X. It’s real easy to do using Lion DiskMaker. This app will prep a 8-GB (or bigger) flash drive with everything it needs to install OS X 10.9 Mavericks. You can also build disks that contain OS X 10.7 or 10.8 if Mavericks isn’t your thing.

Be sure to read the instructions so that you have all the needed files in the right locations. One more note – Lion DiskMaker takes awhile to copy all the files so be patient.

Once done, you can boot a Mac with this flash drive by holding down the Option key at startup.