old Hard drives, reinstalled into new rebuilds

[E-knight]

what are the factors of installing an usable hard drive from my other system. and putting it in my new rebuild. it has windows 7 and of course all of my other good stuff i need.  I am not an expert on this and I don't want to mess this up. what should I do?  and will the bios from the old unit affect the new mother board?

[Allan]

1) Bios has nothing to do with anything. It is not stored on your hd.
2) You will not be able to boot to the old hd in the new system. If you just want to use it as a drive, that's fine. But your old Windows 7 installation will not be usable.

[truenorth]

You have NOT told us whether this is a SATA or IDE  HDD. So if it is an IDE setting the "pins" to slave will be required. If it is SATA you will need to ensure that you have an available SATA port on the MOBO and you will probably need to enable that particular SATA port in the BIOS. truenorth