If you are only using it as a secondary drive as stated, and the new drive has windows already installed, then just plug it in, and start windows. Go to my computer and see if the old drive you just installed is now visible. If it is, you should be able to right click on it in my computer and there will be an option to format. Go for it! You'll then have a blank formatted drive, which can be used as a new storage volume.If you want to keep all of the old files, but you aren't going to use the drive as the main windows installation, then you can copy all you want from the old drive into the new without issue, and then format it.If the second disc does not show up under my computer, then you can find and format it by doing the following. In XP control panel, click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management. On the following screen, find and click Disk Management.NOTE: You can also click Start, point to Run, type diskmgmt.msc, and then click OK.In Vista Control Panel, click System Maintenance, click Administrative Tools and then click Computer Management.In the Computer Management pane, expand Storage, and then click Disk Management.NOTE: You can also click Start, type diskmgmt.msc into the search panel at the bottom of the start window, and then click on the file when Vista finds it.In disk management, you'll see the hard drives listed, including the one you've just added. Right click on it and choose format. Once you have done this, the disc will be visible in my computer, and you can use the formatted disc as a storage volume.
Mitz from Tips4pc