![]() ![]() In the "Security Options" button at least choose the option to zero out all data on the disk, but for added (and perhaps redundantly unnecessary) security you can choose a 7-pass or 35-pass erase. Now go to the "Erase" tab and choose the format to use (Mac OS Extended should be fine). You do not need to set a volume format at this time but can if you want. Once the partition is ready click "Apply" to set up the new volume scheme. When you release the keys, so that the system boots normally, immediately hold down the "C" key so the system boots to the OS installation DVD instead of the boot drive. Then reset the SMC on the system according to the instructions in this Knowledgebase Article, and then power up the system and immediately clear the PRAM by restarting the system and holding down the Option-Command-P-R keys all at once, allowing the system to reset several times before releasing the keys. To do this, at this point insert your OS X installation DVD (preferably the one you are going to include with the system when you sell it). ![]() You can do this immediately before erasing the drive and optionally reinstalling the OS, so the system will be as fresh as possible upon first booting into the newly installed OS. This is perhaps unnecessary, but while we're clearing out all user data and setting the system up from scratch we might as well clear any user-modifiable hardware settings. During the transition to the new system, be aware of any hardware-based filtering or authentication you use and disable or change it accordingly. One example is MAC filtering in routers, where only that system will be granted network access. Not only might there be software-based authorization services, but others may identify your system through hardware. There are ways around this, but they're cumbersome and require going to each service and resetting the authorized systems (at times you may need to call them). Go through your system and de-authorize it from within the program, since even if you format the computer and remove these programs, the online service will still assume you have one system authorized. Many online services require you to authorize the systems you use with their service (Apple's iTunes service does this, and there may be others as well). This is a step that even seasoned computer geeks will often overlook. You can use this backup as a source for migrating to your new system, if needed. ![]() I recommend you do this with Time Machine or a cloning utility such as Carbon Copy Cloner or SuperDuper (there are others as well). Here are some tips for preparing your system so you can rest easy that your old system does not contain anything confidential.īe sure to back up your system before you start preparing it for sale, since the next steps involve erasing your data. Without going into the obvious reasons why distributing your personal data to strangers is a bad idea, once your old Mac has served its purpose and you are ready to sell it, be sure you properly prepare it for sale. ![]()
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