Making another HDD partition bootable

[kraze]

The issue is as following:

I have a first HDD with its first partition set as bootable, having boot manager that includes options to load WinXP (this HDD) and Win7 (on another HDD).
I will be replacing the first drive with a new one - so what's the trick to make Win7 HDD bootable and boot Win7 without the need to reinstall anything (way too much hassle)?

 

[oily_17]

Try EasyBCD, or if you have your Win7 DVD, use the option to repair start up problems.