I have a pryon desk top with Windows 7. The tower appears to have two CD DRIVES but we have only used the top one (D:) to date. We have been unable to open the lower one. Help says there is only one hard disk drive. Does this mean that if we wish to make use of the SECOND drive we have to buy the hardware and instal it. And would we use a second drive for copying CDs and DVDs.It sounds like you may have one CD drive and beneath it is an empty drive BAY with a front cover on it.  Is there any writing on the front of the second, lower "drive"?

Look in the case and see if there is a lower disk drive with data and power cables.
Thank you. There is nothing on the front of the lower drive. We have no GREAT need for the second drive so it is not worthwhile to open up the case. The drive does not open when we press on the button on the side. Your comment just tends to confirm our belief that there is no hardware in the lower drive.Sounds like you have a case which has front flaps with buttons in front of the actual drives. If you are in Oz and you got it from Harvey Norman you can look at their web site and maybe tell us the model?
It is a Pyron PRY-i530SC. I have now asked Pyron Tech Support by email what is the second drive and how to use it. I will post the response. Thanks for providing guidance on what I should do. google of PRY-i530SC led me to the Pyron site which shows this desk top computer.If this is your computer and you or someone else has NOT added another optical drive then you only have one (as Salmon Trout has suspected). Read the specifications listed in the link to confirm for yourself.
http://www.pryon.com.au/solution/Solution_viewSolution.action;jsessionid=C6E542829DE05E750B1746F03209BAA1?id=2140&type=specs
truenorthA lot of cases nowadays, even on entry level machines, have the optical drive hidden behind a spring loaded hinged flap, sometimes called a STEALTH cover. On the front of the case there may be a button which extends inside and when you press it, it pushes the actual eject button on the drive itself. The drawer shoots out and makes the flap open. When the drawer goes back in the flap closes because of the spring. So some people may suppose that each flap hides a CD or DVD drive, however the flap is just part of the case.



I followed Salmon Trout's advice and prized both flaps open against the spring. This confirmed truenorth view that there is not a second DVD/CD drive in this Pyron. I had been to the Pyron site but missed the point in the Specifications about the second drive not being in the machine normally. I expect the Pyron Tech Support response will say this. This seems to close off the issue. Thanks for the help.