IBM 22P6972 - Manual (Page 24)

Read speeds
Media Read Speed
DVD-ROM (single layer) 4.1 - 10X constant angular velocity (CAV)
DVD-ROM (dual layer) 3.3 - 8X CAV
DVD-R (4.7 GB) 3.3 - 8X CAV
DVD-RW (4.7 GB) 3.3 - 8X CAV
DVD-RAM (4.7/9.4 GB) 2X zoned constant linear velocity (ZCLV)
DVD-RAM (2.6 GB) 1X ZCLV
CD-ROM 14 - 32X CAV
CD-R 14 - 32X CAV
CD-RW 10 - 24X CAV
CD-DA (DAE) 6.7 - 16X CAV
Write speeds
Media Write speeds
DVD-R (for general, 650 nm) 2X CLV
DVD-RW (Version 1.1) 1X CLV
DVD-RAM (Version 2.1, 4.7/9.4 GB) 2X ZCLV
CD-R 12X CLV
CD-RW 8X CLV
A-2 IBM Multi-Burner User’s Guide