How to install 1 of 2 win 7 installs on the same computer

[Gene1000]

Hello all,I have an older computer with a SATA drive and an old PATA drive. Each drive has a Windows 7 system on it. When I boot up the machine, it defaults to loading the system on the PATA drive and not the one on the SATA drive because the PATA system is a newer installation. I added the PATA drive for data and need to format it.I do not want the PATA drive system loaded at boot. I want the computer to default to loading the Win 7 system on the SATA drive.How can I change the machine to boot from the SATA drive and not the PATA?The machine is old and the BIOS is old. There is no option in t

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