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Is there a way to wipe a Macbook clean without removing the OS or is that not a concern...that is, can you simply download an OS for free? &nbsp;Basically I want to get a Macbook ready for a new user.
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Is there a way to wipe a Macbook clean without removing the OS or is that not a concern...that is, can you simply download an OS for free?  Basically I want to get a Macbook ready for a new user.

Preparing a Macbook for a new user

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

Operating Systems

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.