... (avoid having both drives connected at the same time, or one of the Windows installations could take control of the other forcing a permanent drive letter change).
Well never heard of or seen this happening in all my Windows installation years. Once the new Windows is installed and has taken up drive C:, The slave drive is irrelevant. So there really is no reason to keep the old one out. Just put it in, and move your files over before it dies.
Basic Steps:
1. Remove Old Hard Drive,
2. Leave New Hard Drive as Master on the Primary IDE connector.
3. Run Windows 'Installation, and have it format and recreate all partitions, (It will wipe out everything on the drive). And install.
4. New Hard Drive should be drive C:
%. Once windows is done installing and works o.k, you can place Old Hard Drive back in as a Slave in the same IDE connector as the New One, or as A Master in the Secondary Connector if available.
Old drive should pick up a different Drive letter, when the Windows Installation in the New Hard drive boots.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.