It allows you to disconnect a drive that is visible in windows from use,
so you can convert it while Windows is running. You cannot do it for
any drive in use by the system - the one with Windows, the one booted
(if different or the one with the page file (again if different).
Generally better I would say to let convert set up to run at boot,
before Windows starts, and essential for one of those in use in that way
like C:
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