Source: http://www.plextor.com/english/products/24_10_40A.html

The PlexWriter 24/10/40A:

Minimum Systems Requirements

CPU: Pentium II 300MHz
RAM: 64MB
ATAPI interface: DMA must be set to ON in every OS. IDE controller must be set to PIO Mode 4 or Auto (Auto will select DMA Mode 2).
How to enable DMA inside operating system. Refer to your motherboard manual on how to set PIO Mode or DMA Mode.
HDD: 1GB free space for writing in CD to Image mode