Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'd love to mount a RAM Disk in OSX Lion on boot. I know how to write the launchd stuff to do it when I want, but is it possible to mount a RAM Disk onto a certain path, so that it would be cleared on boot?

share|improve this question
What version of Mac OS X are you running? – Daniel Sep 28 '11 at 4:17
up vote 3 down vote accepted

With regards to your question, there doesn't seem to be a way to mount it at a specific point, hover to mount it at boot, have you looked at the Make RAM Disk application?

Make RAM Disk is an application that provides an easy way to create, format, and mount a RAM disk in one shot.

If you add the application to your Login Items it will automatically create the RAM disk at each boot.

PS: Tested this on OSX Lion without any issues.

For completeness sake the following is from the Readme File:

How do I use it?
Just run it. By default, it creates a 64-MiB RAM disk named “RAM Disk”.

Can I have it create a RAM disk on startup/login?
Yes. Add it to your Login Items in the Accounts pane of System Preferences.

How do I get rid of the RAM disk?
Click on the Eject (⏏) button next to its name in the Finder's sidebar. Alternatively, use Disk Utility (in /Applications/Utilities) to eject it.

I want to create a bigger or smaller RAM disk or to create it with a different name. How do I do that?
Hold down the Option key while launching Make RAM Disk; it will present a window wherein you can change the size or name of the volume. If the “Save settings for next time” checkbox is checked, the settings you enter here will be saved (obviously); if not, they are forgotten just before quitting.

Remember: the Option key for the Options window.

Can I change the options without actually creating a RAM disk?
Yes. As long as the box is checked, the options will be saved, whether you create a RAM disk or not.

share|improve this answer
Wow, nice. Keen to check this out. – boehj Sep 28 '11 at 14:39

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.