Power on the Mac while holding down the 'Option' key. If OS 10.6.8 or earlier is installed, you can use the original OS install discs that came with the computer. ![]() During formatting and installation, OSX 10.7.5 is automatically installed can’t do anything about it! I wanted to install High Sierra it wouldn’t allow me until I installed OSX 10.8 Mountain Lion! After you install the new hard drive, you will need to boot to the recovery partition on the original drive if OS 10.7 or later is installed. ![]() On my MacBook Pro with OSX 10.13I had a 240gb Solid state hard drive, but I needed bigger! So I got a new Kensington 480gb SSD. Once you have the disk selected, click on the 'Erase' tab on the right. Once Disk Utility is open, select the new drive from the list on the left. In all versions of OS X you can find Disk Utility in the Utilities menu at the top in 10.7, it's also in the main list in the center of the screen. Use Disk Utility to format the new drive. Do I really need to upgrade my Mac hard drive? It’s also surprisingly easy, even if you don’t know your way around the insides of a Mac. Swapping out your old hard drive for a modern SSD is surprisingly affordable and results in 5X better performance: a reputable 500GB MacBook SSD can be had for around $150, while 1TB options are available for around $300 - both considerably cheaper than a new MacBook.
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