DD'ing the Live DVD to the internal hard disk is good for public computers.
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The reason why I say the above is because a Live ISO, when DD'd to the internal hard disk, prevents the permanent messing of system components, because of the fact that it's Read Only. If someone wants to use a computer with the Live Image as the hard disk, they will have to save their data onto a flash drive. If someone does "try" to mess with the system, it can easily be booted back fresh.
How this can be done involves booting from the live DVD, opening a terminal, and typing:
sudo dd if=/dev/sr0 of=/dev/sda [status=progress]
And then once you eject the DVD and reboot the system, the same interface will pop up and you have to select "Try Trisquel Without Installing".
Or, public computers don't even need hard disks and can run from the DVD which is truly read-only.
My lab's public workstations are diskless. Users bring their HDD or SSD and connect them to the eSATA port.
In my opinion, ALL computers, tablets and phones should be diskless, like the Raspberry Pi, no matter what the chipset is. If you buy a computer, tablet or phone, it should come with an external disk, with your choice of a Free OS on it. No internal pre-installed garbage, easy to transfer to another device of any kind.
After all, this is what computers USED to be like in the early 80's right? With their floppy disks?
Nowadays it is called a live system and typically is on a USB key. I very much people like carrying phones with an external drive plugged in. I am also afraid you are suggesting having all user files in a "cloud" (the 'dd' command you propose does not provide persistent storage). Terrible for privacy.
Not unless you are carrying a OS-less USB drive, then you won't need the cloud anyway.
I did purchase one diskless TerranForce barebone and subsequently installed HDD by myself. Of course, the barebone came with original HDD bracket and screws.
But the problem is that very few users are willing to even reinstall the preloaded operating system. They usually don't replace anything until they are forced to do so.
That's correct, yes. But that's on the hard disk, though...saving to the USB drive will still save you your files.
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