No OS is needed, the current OS will treat the second drive as a slave and assign it a drive letter. Just be sure you use the correct connector on the cable. The original drive should be on the end connector, the new slave drive on the middle connector. If the old drive is jumpered (look at the connector end of the drive) as Master, set the new drive as Slave. If the old drive is jumpered as CD (cable select), set the new drive the same.
Once it is installed, you can use is as you wish, but you will need to format it to be able to use it. If you're running XP you'll need to activate the drive and format it. Go to Control Panel, Administrative Tools, Computer Management. On the left, click Disk Management. It will show the drives on the computer. The new drive will show up on the right side. Right click it and follow the prompts.
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OK, this is a pretty basic question, but here goes:
I have a computer with one 60 GB hard drive. I'd like to add another drive, preferably internal. If I add a second hard drive, do I need to install an OS on it as well, or will the OS on the original drive cover both? If I choose to reformat the original drive, can I save things on the new drive and avoid losing them? Anything else I should know about operating with two hard drives?