Virtually all PCs have IDE controllers built on the motherboard. There are typically two, called the primary and secondary controller. More can be added using PCI cards. Each controller can controll two devices, a Master and a Slave device.
There are two issues which can cause noise when doing a CDR burn using an internal IDE burner. The first, quite simply, is if you have an older IDE unit. The first few generations of drives were quite noisy when creating audio CDs, so much so that some publications like PC Magazine just advised people to buy only SCSI drives.
The newer IDE CD-ROM drives are much better and far less likely to introduce noise of their own. And in terms of raw transfer rate the new IDE hard drives are as fast as much more expensive SCSI drives. However, one area where IDE technology is much worse than SCSI is when a controller has to handle both Reads and Writes at the same time (this is why SCSI Raid systems are used in File Servers, never IDE). If the controller your CDR writer is attached to is the same one controlling your source (hard drive or CD-ROM), then you can sometimes pick up noise or distortion.
The setup I use on my DAW is designed to avoid this:
Primary IDE controller
Master device - system hard drive containing the OS (Windows) and programms)
Secondary device - CDR recorder
Secondary IDE Controller
Master device - large, fast, data hard drive containing all my audio data
Secondary device - CD-ROM or DVD drive
By arranging things this way when I am copying either data from my hard disk or duping another CD, each IDE controller is doing only read or writing - not trying to do both.
Another good reason to arrange things like this is it allows you backup an image of your system drive to your data drive using a program like Ghost or drive image. Then you can write the backup out to CD-ROMs. That way if your system drive dies you can pop in a new one, boot up from a floppy disk, and restore your system from your backup cds in minutes.
Anyway let me know if that helps.... Good luck