Assuming that you don't care whether it's a ramdisk or not, the method you describe works very reliably and simply on every operating system. There's a lot to be said for that. If you're not sure you can write to it, simply create a sentinel file with any known-to-you name and leave it there.

In reply to Re: Check that a ramdisk is mounted by Anonymous Monk
in thread Check that a ramdisk is mounted by pmilne

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