The drive has a fresh installation of OS X 10.11 El Capitan. UPGRADE TO MAC OS X EL CAPITAN INSTALLOr you could install El Capitan on an external disk, but it will boot and run much slower and not tell you if installing El Capitan would give acceptable performance for your configuration. This drive is in excellent condition and working perfectly. Depending on the speed of your Internet connection, this download can take hours to complete. Select El Capitan and then click on Download. UPGRADE TO MAC OS X EL CAPITAN MAC OS XApple considers operating system upgrades as purchases. To upgrade Mac OS X El Capitan to macOS Sierra 10.12, the latest updates from Apple.Inc, Download the macOS Sierra 10.12.1 latest version from Apple App Store. The backups are in case something goes wrong, and 2 backups are in case things go really wrong (Murphy's Law is not always happy causing a bad day, if it can make it a worse day). A list of all your previous purchases will populate. I suggest you Backup (and make a 2nd backup), then see if you can create a 30-50GB partition on your boot disk and install El Capitan in the separate partition and try some things out. However, going from Snow Leopard, you will loose the ability to run any PowerPC compiled apps in emulation. If you wish to check for an update, click the Apple icon in the top-left corner of your desktop and select System Preferences > Software Update. It will show the maximum version of OS X you can install, and from what I could see chances are you can go to 10.11 (El Capitan). Go to this web page, select your specific Mac model from this list, click on the associated link, and then look form "Pre-Installed Mac OS". What you are looking for is an app that uses too much of CPU power or Memory. Airport Utility 5.6 will NOT run on El Capitan (while I do not use them any longer, I've owned most of the various Flying Saucer generations of Airport Extreme, including the very first one with the built-in phone modem that would automatically dial-up my ISP). Switch between the tabs observing the processes. This drive is for use with Apple early 2008 to mid 2012 Mac Pro desktop tower computers. You will loose access to the Flying Saucer Airport Extreme. This drive is in excellent condition and working perfectly. All of these "old" features and various others are there to preserve business history files that I cannot afford to lose. and Airport Utility which is currently matched to the original "flying saucer" Airport Extreme. I can live without those features, but of special concern are the Disk Utility, into which I have placed many password-protected files QuickTime Player, which in my version is "pro" upgraded to include various adjustments for color, playback speed, etc. In both computers, there are many features related to mobile devices that won't apply. UPGRADE TO MAC OS X EL CAPITAN UPDATEIt also looks like I might be able to update my MacBook Pro still running Snow Leopard 10.6.8, but the model identifier says "MacBookPro5,1" which doesn't specify the year.
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