Format mac and reinstall mountain lion


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Regardless of the reason, this is not something to be undertaken lightly. The possibility of data loss looms any time you erase your primary hard drive. Fortunately, there are some easy steps you can take to do the job right. Before I start, note that if you are trying to get the machine ready to sell, you should follow some slightly different directions. Backing up your data is something you should be doing on a regular basis — every single day, for most people.

However, any time you propose erasing your primary data storage, it becomes critical. You must do it right, or you will risk losing data. So how do you do it right? Most importantly, make redundant backups. If you only have one backup, remember that when you erase your hard drive, those backups become the one-and-only copy of your data.

ARCHIVED: How do I install OS X 10.8 (Mountain Lion)?

Before erasing the hard drive, make sure you have a minimum of two completely separate backups, on completely separate media, and preferably made with two different backup programs. I highly recommend Time Machine to back up to one hard drive or a Time Capsule, and Carbon Copy Cloner to back up to one or more additional hard drives. The system should eventually boot into the installer, where you first must choose a language. Do so, then choose Disk Utility from the Utilities menu.

Perform a Clean Install of OS X Mountain Lion on Startup Drive

When you see the Apple logo, you can let go. This will start the computer in recovery mode. Once you have fully booted into recovery mode, open Disk Utility. Note that when you begin the install process, you will need to download about 4 GB of data, so be sure your internet connection can handle that before proceeding. Once in Disk Utility, you need to select your hard drive in the list and select the Erase tab.

This step is pretty simple — just follow the directions to reinstall the system on the newly-erased drive. Instead, when the installer finishes, import nothing, and go through the setup process as if this were your first computer. Once your system restarts successfully, you will need to be sure that it is fully up-to-date.


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  • From the Apple menu, choose Software Update, and install any updates that show up. If you reinstalled Mac OS X Once your clean, new system is up and running and fully updated, work on getting all the settings back to the way you like them. July 25, at 4: Stefano says: July 25, at 6: July 25, at 7: Frank says: August 28, at 4: Jt says: September 1, at 8: Matt says: July 25, at 8: Scott says: July 27, at 5: Stelios Gkavakis says: July 26, at Bo says: Prosolusindo says: July 26, at 3: Ben says: July 26, at 6: July 26, at 2: Tim says: July 30, at 8: July 26, at 7: July 27, at 9: Shibbye says: August 3, at EF says: Viggy says: July 26, at 4: Tiny Morris says: September 27, at 8: LSD says: October 26, at July 27, at 1: JJ says: VJ says: Michael says: July 28, at Thomas says: August 14, at 4: Tom says: July 29, at 4: Kevin B says: July 28, at 7: MotionMan says: July 28, at 9: Miss Mouse says: July 29, at Rod Slayer says: July 30, at July 31, at 3: Nobe says: July 31, at 7: August 1, at Ray says: August 2, at August 3, at 5: Brian says: August 5, at August 16, at 9: August 10, at 5: Ps says: August 15, at Sam says: Mike says: October 15, at 2: Lucas says: August 19, at August 21, at 9: Seb says: August 22, at 1: August 22, at 7: Dipp says: August 22, at 9: September 5, at 1: September 15, at 6: September 16, at 8: Jimmy says: December 18, at 9: Aaron says: September 18, at 8: Jeremy says: September 19, at 8: Krishan says: September 23, at Ed says: September 26, at 3: Richie says: September 26, at 1: Ahmed says: September 26, at Khalifa says: October 7, at 8: Shawn E says: October 13, at 6: Simon says: October 16, at 4: December 2, at December 21, at 4: George Mardre says: December 26, at 4: ChaotiX66 says: Now I need to format the new HD.

    Do I need a utility disk?

    Helpful answers

    I never created one on this Macbook Pro can I create a utility disk from a newer iMac? Select the disk from the menu, select your language, then choose Disk Utility from the Utility drop-down menu and proceed to reformat it to the right settings. Then you can go back and install the OS. Try again later can anyone help me how to recover all the apps without recovery disc and without back up? I am just wondering. Hey Adriel. So I'm having a slightly different issue.

    Mac OSX Lion How to do a Clean Install

    I've followed your steps, but every time I hit "erase," it brings up a notice saying: Couldn't unmount disk. I've attached a pic of the error. However, on the left one can clearly see the main " But it allowed me to erase the Macintosh HD option.

    How to Reformat Mac OS X Without a Recovery Disc or Drive « Mac Tips :: Gadget Hacks

    Why is that? Has my drive been erased nonetheless? Or do I still need to do something else? Is all hope lost?

    Upgrading from Mac OS X 10.7 (Lion)

    I'm now stuck on the pop up window which says "To download and restore Mac OS X, your computer's eliegiiilty will have to be verified with Apple. Loading Installation information It shouldn't be too long. If that doesn't do the trick, there's another more complicated course of action you could try. Step 1: Back Up Your Files! When erasing the harddrive, which format is ideal? Could there be a problem with the Apple servers or what? My hard drive crashed on my Imac took it to computer repair they installed new hard drive, tried to recover data but could not, when we presented the imac to the apple store they told me i would have to buy back my old hd from them um hello no way, so thats why we went to another place that works on macs, so apple said i had lion on the mac, i couldnt remeber but now i remember i had leopard, the computer place installed lion, well now I cannot get any of my programs installed from the dics i have, like my photo software, etc, any cd i put in stays in for a minute then pops back out any help on this?


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    • I have tried to do step 3 to get to the OS-X utilities screen. I cannot do it. Help needed. Opss almost forgot! Not even the dvd drive is working for the iMac. Happy days indeed. Could it be worst than a bad drive?



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