OS X Yosemite is already available in the App Store and you can download it absolutely free of charge right now. The new OS will be installed directly on top of OS X Mavericks, and all your data and applications will remain in their original places. Alas, the performance of some of them is not guaranteed and this is due to the need to release updates from application developers. Uninstalling and reinstalling the application may solve the problem, but the stability of the work will remain in question.
If your OS X has already passed several stages of updating, and the thought of a clean reinstallation of the entire system creeps into your head – feel free to fight!
A clean install means full hard disk / SSD formatting. All data, programs, applications and everything that has ever been installed on a Mac will be irretrievably lost (contacts and accounts attached to iCloud will remain after re-entering the already reinstalled system). If, after these lines, nothing yoked in your heart, but your heart is still calm, then proceed to a clean reinstall.
1. Connect a removable hard drive, USB flash drive or any drive that is enough to save all your data (photos, music, documents) and copy them. (To take full advantage of recovery through Time Machine, follow the instructions ).
2. Making sure that everything you need has been transferred to an external drive, go to the App Store and download the OS X Yosemite image .
You will have to perform this step without fail , because in order to have a clean installation, your account must first upgrade to OS X Yosemite. Only in this case, the Mac will offer to reinstall OS X Yosemite (and not OS X Mavericks when skipping the update from the App Store).
Thus, you first upgrade your existing OS X Mavericks to OS X Yosemite through the App Store, and then perform a clean installation of the system.
After upgrading to OS X Yosemite via the App Store and successfully logging in, reboot.
3. As soon as the sight of a white screen appears and Mac produces a characteristic sound of the download – we press the key combination the Command + the R . Patiently waiting for the passage of the loading bar.
4. We are greeted by the OS X Utilities window . Select Disk Utility and click Continue .
5. Select the Primary disk on which the system was installed, give it a name and select Erase . After a few seconds you will see a completely blank disc.
6. Close the disk utility and go to the Reinstall OS X option (in the OS X Utilities menu). As the target disk for installation, select the newly formatted one. Installation will begin immediately.
When reinstalling the system from scratch, consider that you must know the password for the account used in the Mac App Store . Otherwise, the installation will be impossible.
7. Pay attention to the WiFi connection status (upper right corner) – the Internet is required, since the system will be loaded from Apple servers. Otherwise, you risk getting an error.
Depending on the server load at a particular point in time, the installation may take from 20-30 minutes to several hours . If you have the ability to connect using a twisted pair power cord , this can speed up the download significantly.
After the reboot, you will be greeted by the new OS X Yosemite start screen and will offer to go through the usual steps of the “first entry”.
Successful installation and testing of the new OS X Yosemite.