"Running Linux from a USB stick is a fun and sometimes useful
distraction. It can be handy if you want to try another
distribution, for example, but can't commit to the drive space. Or
perhaps your netbook insists on running Windows while your heart
hankers for Ubuntu. But running a single, monogamous distribution
can be a little limiting, and there's only one reason why you can't
squeeze a few more alongside on any decent-sized USB stick: it used
to be quite a difficult process.
"Don't get us wrong, multi-booting off a hard drive has become
relatively easy. Distributions will do all the hard work for you,
and even manually adding your own options to the Grub bootloader
isn't that difficult or dangerous any more. But a Live USB
installation is different. The root file system is compressed into
a single file, and this needs to be expanded into an area of open
temporary memory as the system boots, usually through some custom
Grub trickery and an ISO loader. With multiple Linux distributions
on the stick, this process needs to be configured for each. And
while it's possible to do this manually, it's a long and arduous
task. Fortunately, there's a better solution available."
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