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mode. Classic mode is what Shadow 3 has always used. In Compatible mode,
the Shadow 3 alters the HD control block to be more compatible with some
motherboard / OS combinations, in particular, 2007 and newer motherboards in
combination with Windows 10.
The modified behavior is entirely in software, the HD is never physically altered
by the change.
There is no guarantee either mode will allow a shadowed HD to boot.
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