Q How to save space on your hard drive?
A If you had recently bought a Mac, then cleaning your Mac’s hard drive is more about sticking to a few simple advice:
If you’re an advanced Mac user, then there are more ways to clean up your Mac and thus free more space before Mountain Lion installation (or for any other reason possible). In short, you can
Q How much space for Mountain Lion do you need?
A If you are upgrading from Lion to Mountain Lion, then you need 8 GB for installation files and additional 15% of free hard disk space for the system to work stably after installation, as practice shows.
To know how much hard drive space you have (free and occupied) open Finder, choose one of your hard drives and click Get Info in the contextual menu. Alternatively, you can get the similar info via Apple’s Disk Utility.
Free up the necessary amount of space by methods described above or buy an additional hard drive (in this case we recommend you to buy SSD drives, since they are much faster than HDDs).
If you have Mac OS X Snow Leopard, you will need to upgrade to Lion before upgrading to Mountain Lion. 4 GB of free space will be enough room for Lion upgrade, but the same 15% of free hard drive space are needed to ensure stable performance.
A First of all, check your Mac compatibility with Mountain Lion here: http://www.apple.com/osx/specs/
If it is, then do the following:
Now, get ready to install Mountain Lion!
Q Finally, How to upgrade a Mac to OS X Mountain Lion?
A Now that your Mac is ready for upgrade, open the Mac App Store and purchase Mountain Lion just like you purchase any other app. After that Mountain Lion will be downloaded. Now you can open this file and follow further instructions to install it and upgrade Mac OS X to Mountain Lion.