How to wipe file slack on OS X

A tutorial explaining how to wipe free space, including file slack on Mac OS X

Still the best wipe utility for Mac OS X

with 3 comments

The new user interface

BCWipe, which has long been the most advanced option for secure wiping of data on Mac OS X, just got even better by implementing a graphical user interface to make it easier to use. The new interface is uncluttered and simple, and BCWipe still has far more options than the built-in wipe options in Apple’s Disk Utility (including wiping file slack, which Disk Utility does not do). Also, it does not prevent you from wiping certain types of drives. Download the new version here.

As SSDs are becoming more prevalent, there are a few things people need to know. Ars Technica has a good article on the subject. So does LifeHacker. SSDs store data differently from hard drives, thus wiping individual files makes little sense. Also, using full drive encryption from the day you buy your new computer is a good idea. One to three passes of zeroes when wiping free space or a whole drive is the best way to go, although these measures do not give full security. The only secure way to wipe SSDs would be using special manufacturer software to issue a wipe command. This is not supported on all drives or in all scenarios. BCWipe still offers the best option available with conventional software, namely wiping free space or an entire drive with zeroes, and it does it fast and well. If you want to regularly wipe cache and logs, I recommend using the command-line version of BCWipe and making a script, as described here.


Written by wipetutorial

August 30, 2012 at 8:32 am

Posted in Uncategorized

3 Responses

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  1. Hello,
    I have been dealing with a rootkit on my Macs, and i have run into yet another problem. This root kit mimics a physical device and no mac software has affected it. PDWipe, a Dos program will remove it, but this software has not been updated to support sata drives. So I’m hoping this software will take care of the problem. Drive Genius by Prosoft, iPartition by Coriolis, and of course Disk Utility don’t do anything. Any thoughts or advise would be appreciated.


    August 5, 2013 at 12:26 am

    • This isn’t the correct software to deal with a rootkit, Peter. Deleted data is usually as inactive as wiped data. You need some sort of antivirus. Maybe AdwareMedic does the trick? I would recommend a complete reinstall of all affected systems, though.


      August 28, 2015 at 11:45 am

  2. It’s really a great and useful piece of info. I am happy that you simply shared this useful information with us. Please stay us up to date like this. Thank you for sharing.|

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    August 5, 2013 at 7:29 pm

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