Linked by Andrew Youll on Sat 29th Oct 2005 12:55 UTC, submitted by Duke
Amiga & AROS Hyperion Entertainment, creator of various Linux game ports and currently working on the next generation Amiga OS, has now unveiled their new dedicated Amiga OS 4.0 website. It showcases important features and is targeted to current and new users as well as potential OEM clients.
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RE[4]: I am wondering...
by henrikmk on Sun 30th Oct 2005 00:20 UTC in reply to "RE[3]: I am wondering..."
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I don't think it's unique, but it's being used in a unique way in AmigaOS, and behaves just like any other storage space. The space is temporary, so you can screw around with it as much as you like. It's just a directory that automatically gets wiped when you reboot. It stretches in size with how many files you put in it. You don't waste diskspace or have to bother with deleting stuff.

If you are experimenting with settings, possibly radical ones, or other things that might lock up your system, shift your monitor out of sync or render your mouse unusable, what do you do in Windows? You roll back. It's expensive on disk space and may not even work.
In AmigaOS? You just reboot and everything is back to normal, because changes are not written to disk unless YOU want them to be, when everything is just right.

What isn't mentioned particularly clearly is that you can also mount a RAD: device, essentially a RAM disk that is persistent across reboots. The RAD disk is fixed in size like a real disk. What can you do with that?

Copy the contents of your system partition, whatever fits in your memory to the RAD: disk. When you reboot, select that you want to boot from it and voila. It doesn't use the harddrive anymore! This is why AmigaOS can boot from a flash ROM. Also there is no swapping needed, which just makes it even faster.

Needless to say, RAM and RAD disk was extremely useful if you only had a floppydrive and needed temporary storage space, but essentially any kind of slow, small or write-limited storage like Flash ROMs on mobile devices will become almost as flexible as a harddrive based system.

I remember mounting a RAD disk on my very old Amiga 1200 without a harddrive. I could cold boot with a floppy, which could take about 30 seconds. The contents of the floppy would be stored in the RAD disk, so that a reboot would take 2-3 seconds. It's a way to create high-availability systems, that really only is possible with AmigaOS.

Edited 2005-10-30 00:23

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