Macintoshes can naturally download and reinstall their working framework.This procedure ordinarily keeps your personal files, however, you can erase or delete them.You can likewise make USB installation media to speed up installing OS X on numerous Macs.This is normally a simple procedure — simply boot to OS X Recovery and select Reinstall OS X. Make sure to delete your own files in case you’re selling or reinstall of your Mac.
Reinstall From OS X Recovery:
N.B : Your documents and client settings will be saved when you reinstall OS X along these lines.
To begin with, you’ll have to restart your Mac. Click the Apple menu at the highest point of your screen and select Restart. After your Mac restarts and when you see a dim screen, press and hold down the Command (⌘) and R keys at the same time.You’ll enter OS X Recovery and the primary thing you’ll see is a “choose your language” screen.
Select the Reinstall OS X option in the wake of choosing a language and you’ll be strolled through the procedure of reinstalling OS X on your Mac.
When you’re asked which drive you to need to want to install OS X on, select your present disk — it will most likely be the only disk accessible here. The wizard will walk you through the procedure.
Delete Your Personal Files and Settings:
In the event that it’s a great opportunity to offer your Mac or simply pass it on to another person, you might not have any desire to keep your own records.You might need to erase them and perform a full “factory reset” resetting the Mac to a like a new state with no of your own information. You can do this from the OS X Recovery screen.
Before reinstalling Mac OS X on this screen, open the Disk Utility and select your Mac OS X startup disk. Click the Erase tab and utilize the option here to erase the whole disk.Every one of your records — including the Mac OS X working framework itself — will be wiped away.
On the off chance that you have a modern Mac, it presumably uses a solid state drive so your information won’t be recoverable.
You may now reinstall Mac OS X from the Recovery Mode screen like you would above. You’ll wind up with a like-new framework without your own documents.
Make and Install From USB Installation Media
You might need to make USB install media as opposed to downloading Mac OS X on the fly.This is particularly valuable in the event that you plan to reinstall or redesign Mac OS X on numerous PCs.We’re covering Mavericks here in light of the fact that it’s the most recent version. It’s accessible allowed to all Mac clients on the Mac App Store, so everybody can make establishment media with this trap. Future forms of Mac OS X ought to work correspondingly.
To start with, you’ll have to download the OS X Mavericks installer from the Mac App Store. Now you Open the Mac App Store application, hunt down OS X Mavericks, and click Install App. Confirm the download — we require the installer itself to make recovery media.
Insert your USB drive. You’ll require a USB drive 8 GB or bigger in size. You can likewise use an SD card or another kind of outside drive.close the installer when it shows up — it doesn’t have an implicit, graphical approach to making USB installation media. To do this with a graphical interface, introduce the free, third-party Disk Maker X application and dispatch it. It will walk you through the procedure.
To do this with Apple’s official tools, you’ll have to use the terminal. To open the Terminal application, press Command + Space, Terminal, and press Enter.
Run the following command, replacing Name with the name of the USB drive you’ve embedded/inserted. For instance, on the off chance that you see that the USB drive is named “Drive” on the Mac desktop, you’d supplant Name with Drive.
sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia –volume /Volumes/Name –applicationpath /Applications/Install\ OS\ X\ Mavericks.app –nointeraction
To speed things up, press Tab to use tab consummation while writing this charge or duplicate glue it straightforwardly into the terminal.
Don’t hesitate to erase the Install OS X Mavericks application from the Applications organizer in Finder a short time later. This will free up almost 8 GB of space.
On the off chance that you have a Mac OS X installer USB drive or DVD, you can simply insert it into your Mac and boot from it to reinstall Mac OS X. To boot from an external device on a Mac, restart the Mac and hold down the Option key toward the begin of the boot process. You’ll have the capacity to pick between connected boot devices.