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os x lion safe to wipe free space?

Discussion in 'Mac OS X 10.7 Lion' started by UKBeast, May 25, 2012.

  1. macrumors 6502

    As you know with os x lion apple disabled the option to wipe free space for SSD users. CCleaner the popular pc software now appears on mac os (app store) and its got the feature to erase free space. Do you think it is necessary and safe to erase free space with ccleaner ?
  2. macrumors demi-god


    No, there's no need to do that and doing so creates unnecessary writes to your SSD, shortening its useful life. You don't need "cleaner" or "maintenance" apps such as CCleaner to keep your Mac running well, and some of these apps can do more harm than good. Some remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process.

    These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space. Some of these apps delete caches, which can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt.

    Many of these tasks should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance.

    Mac OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.

  3. macrumors 6502

    when i was using sl, wipe free space helped a lot to recover my lost performance, but i am not sure if it works the same with lion or now. If apple disables or removes something from the system, this means they know something.
  4. macrumors demi-god


    Wiping free space will have zero impact on performance. What's stored or installed on your hard drive has no impact on performance. Only running apps impact performance.

    Performance Tips For Mac OS X
  5. macrumors 6502

    thanks i have just uninstalled cleanmymac and ccleaner from my system by your precious advise
  6. macrumors demi-god


    Very wise move! To make sure you got it all, the most effective method for complete app removal is manual deletion:
  7. macrumors demi-god


    I see from your previous posts you have an OEM Apple SSD? If you do, it should have native TRIM enabled by default and that will keep the drive in good shape without needing to erase free space or anything.

    What you may have experienced before with Snow Leopard when doing an erase free space is by doing that it TRIMs all free space on the drive and hypothetically increases write speeds.

    You can still TRIM all unused space if you want in Lion. Just startup in single user mode, then enter the command "fsck -fy" (without the quotes). You will see a message that free space was TRIMed. Then just type in reboot to restart the computer.

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