Can I buy and install snow leopard on new blank hard drive or download it and do the same.

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    Snow Leopard media only comes on disk, not as a download.

    You can install if you have an optical drive, at least 5Gb of hard drive space, a Mac with an Intel processor (Mac released before about 2011), and at least 1GB of memory. It will install on a new blank hard drive after the hard drive is formatted as Mac OS Extended (Journaled) using the Disk Utility on the Snow Leopard DVD. As well, the installer may format a blank disk automatically before installing Snow Leopard. Snow Leopard will also install as an upgrade on an older Mac OS (such as OS 10.5 or OS 10.4).

    If your Mac does not have an optical drive (or access to an external optical drive), the Snow Leopard DVD has Remote Install software allowing installation using the optical drive of another Mac connected to the same network.

    On newer Macs that will not allow installation of Snow Leopard, I have been able to install Snow Leopard on a partition on an older Mac, then use Disk Utility to create a DMG file, transfer the DMG to newer Mac and RESTORE the DMG to an empty partition on the newer Mac. Snow Leopard will run on my newer iMac, but it will not install on the newer iMac. (I need Snow Leopard as I have some software that is only compatible with Snow Leopard, not Lion or later.)

    Personally, I install different OS versions on different hard drive partitions. Then, I can start up from whichever partition to work with the OS version I choose. With my old iMac, I could start up in OS 10.4 or OS 10.6. With my new iMac I can start up with OS 10.8 or OS 10.6.

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