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Helpful answers
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Oct 23, 2013 12:19 PM in response to JorgeHPLby mende1,Mavericks' Disk Utility detects Fusion Drive, so you won't have any problem formatting the Fusion Drive.
First of all, make a backup of your files with Time Machine > http://support.apple.com/kb/HT1427 Then, insert the USB drive, hold the Option key while your computer is starting and select it.
After that, open Disk Utility, choose Macintosh HD in the sidebar, go to Erase tab and erase it. Finally, close Disk Utility and install OS X Mavericks.
I recommend you to upgrade to Mavericks instead of making a clean install, so you will save a lot of time. Then, if it doesn't work correctly, erase the hard disk and reinstall OS X Mavericks
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Oct 23, 2013 12:20 PM in response to JorgeHPLby Kappy,Should only need to reinstall as you would normally do:
Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
the Security button and set the Zero Data option to one-pass. Click on
the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
because it is three times faster than wireless.
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Oct 23, 2013 12:22 PM in response to JorgeHPLby mende1,Remember to start up from the USB drive instead of Recovery HD. If you use Recovery, you will reinstall OS X Mountain Lion
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Oct 23, 2013 3:00 PM in response to JorgeHPLby JorgeHPL,Thank you, but I think I did not explain myself correctly:
I made a USB boot disk with the Install Mavericks app using the Terminal, I booted from it but I cannot erase the Disk... only the volume labeled Macintosh HD
What I want is to erase everything from my fusion drive so that I can also install a 10.9 Recovery Partition from the USB boot disk I created.
How can I do this since the Disk Utility (booted from the external USB disk) does not give me the option to erase the whole disk???
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Oct 23, 2013 3:20 PM in response to JorgeHPLby JorgeHPL,In other words: is there a way to update the Recovery Partition of the fusion drive to 10.9 Mavericks???
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Nov 1, 2013 11:15 PM in response to JorgeHPLby markelimaggie,This update screwed my mbp really bad I tried downloading and installing lots of times but just before it finishes it crashes and reverts back to download phase will somebody pls help me I chose apple over other platforms knowing it was less problematic like this. it did but when this new os arrived it messed everything up
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Jan 25, 2014 6:05 PM in response to JorgeHPLby Bettsy59,Mac software RAID seems unable to partition a RAID and, as I believe the Fusion drive is actually two drives, a spinning HDD and an SSD, that would present to Mavericks as a RAID, I imagine that Mavericks can't install a recovery partition on it at all. I know my wife's iMac Fusion has no recovery partition and you can't have a recovery partition with a Mac Mini Server with the drives RAIDed.