Lion upgraded, have disc, now I'd rather clean install. How?

Discussion in 'Mac OS X Lion (10.7)' started by Jmodamagicmofo, Jul 20, 2011.

  1. Jmodamagicmofo macrumors member

    Jun 27, 2008
    As title says, I have upgraded to Lion but it is pretty slow and I'd rather do a clean install to help tidy things up and speed it up. I have the a disc burnt of the dmg but don't really know what to do now. Could someone walk me through a detailed process for doing a clean install and restore from time machine backup at this point? Much of what I've read pertains to creating partitions, something I've never done before.
  2. Regaj macrumors member

    Aug 15, 2006
    Why would you want to do a clean install, only then to restore from time machine? Rather defeats the purpose.

    As to how, you should be able to use disk utility from your SL install disk to format your drive, then boot from the lion image to begin the installation.
  3. canyonblue737 macrumors 6502a

    Jan 10, 2005
    even easier solution now guys...

    since you already upgraded to lion there is a hidden partition with everything necessary to do a reinstall, INCLUDING A CLEAN INSTALL, already ON YOUR HARD DRIVE. simply reboot holding command - R and it will boot into the lion installer, NO INSTALL USB/CD needed! then use disk utilities (from the install menu) to erase your drive followed by CLEAN INSTALL of Lion! Look ma, no install disk! :)
  4. Jmodamagicmofo thread starter macrumors member

    Jun 27, 2008
    I'm showing my noobishness here, I guess I thought that a clean install followed by a time machine restore would at least leave behind a lot of the fragmentation (?) and the system would run faster. What do people normally do when they clean install? Manually drag files over from the backup drive? That seems like a PITA.

    good to know. Thanks for the tip!
  5. canyonblue737 macrumors 6502a

    Jan 10, 2005
    yep, that's what we do. it's also why many never do a clean install, or like me only do a clean install when i put an entire new operating system on, once every 2-3 years. i think it is worth it, but if your machine is running well right now and your satisfied it isn't a big deal.

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