Snow Leopard was succeeded by Mac OS X Lion (version 10.7) on July 20, 2011. Snow Leopard was also made available as part of a Mac Box Set that included iLife and iWork. The release of Snow Leopard came nearly two years after the introduction of Mac OS X Leopard, the second longest time span between successive Mac OS X releases (the time span between Tiger and Leopard was the longest). As a result of the low price, initial sales of Snow Leopard were significantly higher than that of its predecessors. On August 28, 2009, it was released worldwide, and was made available for purchase from Apple's website and its retail stores at the price of US$29 for a single-user license. Snow Leopard was publicly unveiled on June 8 at the 2009 Worldwide Developers Conference. This is also the first Mac OS release since System 7.1.1 that does not support Macs using PowerPC processors, as Apple now intends to focus on its current line of Intel-based products. New programming frameworks, such as OpenCL, were created, allowing software developers to use graphics cards in their applications. Much of the software in Mac OS X was extensively rewritten for this release in order to take advantage fully of modern Macintosh hardware. Addition of new end-user features was not a primary consideration: its name was intended to signify its goal to be a refinement of its predecessor, Mac OS X Leopard. Booting off that drive will also allow erasing via.Unlike previous versions of Mac OS X, the goals of Snow Leopard were improved performance, greater efficiency and the reduction of its overall memory footprint. Install OSX on an external drive or borrow one with OS X installed.

The Mac to erase mounts as a drive, and Disk Utility can be used with it.

That erase free space option in Disk Utility is for making the deleted files non recoverable.

You can't erase the internal hard drive without the OS X installation discs.Installing Mac OS X on Blank Hard Drive Using Internet Recovery - Duration. iMac Erase and Restore (Late 2009) (Not a Tutorial).

Where, I am seeing “Instruction” links, for Mac Operating System, for as far back as Mac OS X 10.7. Where and with working to reformat my new HD, I have been directed to base “Support” and then 'Knowledge Base Answer ID 3865. Release the keys when you see an Apple logo, spinning globe, or other startup screen. To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard.

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