Hello
I have a old pc with a twenty gb hardrive that still works fine, I have just bought a new one also, i wondering is it possible to connect the old one with the new one so i can use it to store music on what WOULD i need to achieve this if it is possible, i will only be using the one monitor., what cables will i need
thanks Some newer PCs and hard drives use Serial ATA whereas the older PCs are IDE. There are different cables for both types. It'd depend on if your mother board had both.

There is some work involved in setting jumpers for master/slave configurations with multiple HDs on the IDE spec.You did get an IDE drive, not a SATA, right?  If so, you should be able to install the new drive along with the old one, assuming you have space inside your computer case for both drives and your computer's power supply is adequate to support the additional component.  

As the other POST said, you'll need configure one drive as master and the other as slave.  You should have some documentation with your new drive that has some info about this.  Note that your computer's BIOS may not recognize the full capacity of the new drive.  How old is your computer, and how large is that new drive?  If your BIOS will not recognize the full capacity of the new drive, look for documentation on this from the hard drive manufacturer; you may need to visit their website and download an "overlay" to install so that you can utililize the full capacity of the new drive.Any DETAILS about the hardware would be HELPFUL in getting an appropriate response.  

If both are IDE have a look here:

http://www.g4tv.com/screensavers/features/29084/Add_a_Second_Hard_Drive.html

http://www.ehow.com/how_6030_install-second-hard.html