scsi-ide is an kernel driver that provides a SCSI interface to IDE HardDisk / CD / DVD Drives. It is most commonly used for CD Burning as all burning apparently needs to be done over a SCSI interface.

To enable this in your kernel you must select the following options

ATA/IDE/MFM/RLL support

IDE, ATA and ATAPI Block devices

SCSI emulation support

You also need to enable generic SCSI support in your kernel.

Then you will need to add a line similar to the following to your lilo/grub configuration (Example is for lilo)

append="ignore=hdc,hde hdc=ide-scsi hde=ide-scsi"

This tells the kernel not to use the native IDE driver for hdc and hde and instead to use the ide-scsi driver. This should give you /dev/scd0 which would be /dev/hdc otherwise /dev/scd1 which would be /dev/hde otherwise