IBM 22P9176 manual Read speeds, Write speeds

Read speeds

Media	Read Speed AC/Aux Power	USB Standard Bus Power
DVD-ROM (single layer)	8X Max.	4X Max.
DVD-ROM (dual layer)	4X Max.	4X Max.
DVD-R (4.7 GB)	4X Max.	4X Max.
DVD-RW (4.7 GB)	4X Max.	4X Max.
DVD-video	4X Max.	4X Max.
DVD-RAM (4.7/9.4 GB)	2X Max.	N/A
DVD-RAM (2.6 GB)	1X Max.	N/A
DVD+R	4X Max.	4X Max.
DVD+RW	4X Max.	4X Max.
CD-ROM	24X Max.	10X Max.
CD-R	24x Max.	10X Max.
CD-RW	16X Max.	10X Max.
CD-DA (DAE)	8X	4X

Write speeds

Media	Write speeds AC/AUX Power
DVD-R (for general, 650 nm)	2X
DVD-RW (Version 1.1)	1X
DVD-RAM (Version 2.1, 4.7/9.4 GB)	2X Max.
CD-R	16X Max.
CD-RW	10X

A-2IBM USB 2.0 Portable Multi-Burner: User’s Guide