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. The format process can take up to several hours depending upon the drive size.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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.Click on the Erase tab in the DU main window.

Select the volume you just created (this is the sub-entry under the drive entry) from the left side list.Click on the Partition button and wait until the process has completed. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button.

Under the Volume Scheme heading set the number of partitions from the drop down menu to one.

Otherwise, click on the Partition tab in the DU main window. SMART info will not be reported on external drives.

If it does not say 'Verified' then the drive is failing or has failed and will need replacing. Note the SMART status of the drive in DU's status area. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list.Open Disk Utility in your Utilities folder.

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