Make RAM Disk, a very peculiar utility

I suppose that most of you know how RAM works, but just in case I clarify it: this type of memory contains data whenever electricity is present, so when we turn off or restart the computer -with the consequent power cut- the data disappear.

The grace of Make RAM Disk is to have a quick access folder in which we can put temporary documents, but we have to be aware that everything we put will be later eliminated.

Ideal for people who download and then order the files, as well as to take screenshots that we upload to the cloud but then we don't want on our Mac.

Link | Make RAM Disk


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  1.   Carlinhos said

    I am doing various little tests, the lesson is appreciated Jose Luis 🙂

  2.   Jose Luis Colmena said

    mmm, it seems to me that you have not lived in the days when the total memory we had was 20 MB ... Let me explain:

    A RAM Disk is not used for these things that you indicate, it is really used to save a work and access it as soon as possible, that is, imagine a psd image with 50 layers, that its weight is 1 GB, you have 4 GB of RAM and a 2 Ghz iMac C2D. We already know that PhotoShop is very fast, but when you put a 1 GB file with 50 layers ... things vary a lot. When you need to record the changes repeatedly, you need access to said beastly file and a Hard Drive is too small when it comes to recording it, that is, it is slow as hell.

    This is where the RAM Disk comes into play. A 1,5 GB RAM Disk, with an access speed equal to the speed of the FSB, that is, 667 Mhz or 1066 Mhz. How long does it take to save the changes? Two seconds? For this the RAM Disks were created.

    I've been using RAM Disks since ... well, I don't remember, rather since Apple let us use them.

    Go to terminal and type this: hdid -nomount ram: // 4194304

    Now go to Disk Utility, an unmounted image will appear, format it as HFS +, and you will have a RAM Disk on the desktop.

    To erase it and get your RAM back, eject it. Remember to copy the information it contains to the physical Hard Drive.

    More RAM Disks:

    Create 1GB Raw RAM Disk:
    hdid -nomount ram: // 2097152

    Create 2GB Raw RAM Disk:
    hdid -nomount ram: // 4194304

    Create 3GB Raw RAM Disk:
    hdid -nomount ram: // 6291456

    Create 4GB Raw RAM Disk:
    hdid -nomount ram: // 8388608

    Create 8GB Raw RAM Disk:
    hdid -nomount ram: // 16777216

  3.   Jose Luis Colmena said

    By the way, do you want to see the real speed of a DiscoRAM? create a 500 MB file and duplicate it on the same RAM disk, or create two RAM Disks and pass the file from one to the other: p