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Most physical machines ship
with a single operating system,

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like you know, Windows 10
or Mac OS X,

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but it’s possible to have
multiple systems

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on the same physical machine,

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even with a single hard drive.

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And you can choose to do this

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so that you can have different
security domains.

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One OS X could be
for general use

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and the other could be locked
down for security and privacy.

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When you switch the machine on,

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you’d be presented with the option
for which OS you want to boot into.

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And you know, here is
an example here,

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the sort of screen
that you might get,

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and here’s the sort of screen
you might get in Windows.

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And dual boot is a viable option
for different security domains,

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but it lacks some flexibility

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in that you can't access multiple
operating systems at the same time

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like you can with virtual machines
and with some other options.

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So one viable option could be to go
with Windows as your standard boot,

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and you secure that and you
use that for everyday use,

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and then you go with a Linux based
operating system like Debian,

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and you increase the security,
lock it down more

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and use it for more
extreme privacy.

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So with dual boot, you do get
that separation,

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you can get the privacy
and security balance,

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but because this is virtual,

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depending on how you’re storing
files on one operating system,

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and on the other
operating system,

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they could be used
to compromise each other.

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There is no real isolation in
the file system with dual boot.

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They can have different
file system types

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and that can make it difficult to get
access to your other files,

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but it’s not an actual
security mechanism.

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So there is a potential vulnerability there
with those dual boot environments,

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as to whether or not you can get
the files from one operating system

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that should be accessed
in the other operating system.

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And if you want
to do file sharing,

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then you will find that you'll need
a solution for that,

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which would be a file system
that they can both access,

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or some sort of remote
storage or external disk

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or some sort of file system that
they can both access, like I said.

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How you set up dual boot

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is very depending on the operating
systems that you’re going to go with,

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you’re going to need to figure
out how to do that

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based on the operating
system that you’ve got,

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and also on the machine
that you’ve got.

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So different machines will enable you
to get into the bios in different ways.

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There is a pretty good website
that explains the various options,

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and that’s here,

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but if you Google dual boot

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and the operating systems
that you’re wanting to use,

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then you'll find some information
on how to set all that up.

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So it’s an option that
might interest you.