Please any one can specify how to write CD-ROM Driver on windows xp. Is there any ready made reference source code available or any API ?. How exactly it works ?

This post is kinda confusing. Do you mean to ask how to write a device driver for a CD/DVD drive? (the confusion comes mainly from the last line "How exactly it works ?", since if you are going to write a device driver, you would probably understand what a device driver is and how a device driver works. I guess my follow up question is: Why do you need to write a device driver for something that already has one in XP and (as far as I can tell) works great? Anyhow, some info: A device driver is an application that is used by an OS to interface with a device (be it a printer, hard disk, cdrom, or usb port). These are typically written in either C, C++, or ASM. They must adhere to the device driver standards published by the OS vendor. In the case of XP, microsoft is the one that sets these standards. To learn more about device drivers as well as obtaining APIs for developing them go here: Microsoft Device Drivers Hope this helps, Chi "They mostly come at night...mostly"