PA20Pilot said:
[............]
Don't let anyone tell you you can't have a clone copy and the
original disk installed at the same boot time because Windows
will get confused with two operating systems installed. The
BIOS or whatever will know where to boot from, and won't
be confused by another disk with the same info on it.
What you say is literally true - a clone and its original OS
can reside in the same machine, even on the same hard drive.
But unless you're using one of the very few cloning utilities
which handles the problem of the clone's first startup in the
presence of its "parent" OS, the "files" in the clone can end
up being merely pointers to the corresponding files in the
"parent" OS. You can edit what you think are separate files
in the two systems, but "they" will actually be one file - the
original file in the "parent" OS. And if you subsequently delete
the "parent" OS and its partition, you also delete your only
copy of that file. The difficult feature of this problem is that it's
random - only a few files are affected. If those files happen
to be part of the registry, you find out very fast, and you can
correct it by re-cloning the "parent" OS. But if those files are
just archived text documents, you may not find out for years
that the file is gone. Like I've said, the way around this problem
is to hide or remove the "parent" OS from view of the clone
when the clone is started up for the first time. Thereafter, the
clone can see its "parent" OS during startup without a problem.
Note that this affects the startup of the clone only. The "parent"
OS can be started up immediately after the cloning, and seeing
its clone has no affect on the "parent's" files or the files of the
clone.
This problem affected the Windows clones produced by all
the cloning utilities, and most people didn't notice it because of
its obscurity and because clones were usually not booted until
the "parent" OS had expired due to hard drive failure. But when
you have multiple clones of the same "parent" OS in the system,
such as I do, this problem is eventually noticed. Fortunately, at
least one cloning utility has solved the problem, that being
Casper 4.0, and the clone can be started up with its "parent" OS
in view, and its files will remain separate from those of its "parent"
OS.
Note also that this problem is a Windows problem (or design
feature by Microsoft to discourage pirating), and it doesn't affect
Linux or OS X or Solaris (as far as I know).
*TimDaniels*