There is no Master / Slave setup with Sata.
you can have 1 device per sata port on your motherboard.
1. Get a New HDD and plug it into your computer (sata port 1)
2. Dissconnect your old one
3. Install windows on ur new one
4. after windows are drivers are all done, connect your old HDD to sata port 2 or higher and you will be able to see and access your old information
each sata port is numbered on your motherboard, it can be small but will be labeled right next to the port.