write speed of drive in December iBook

Does anyone know what the maximum write speed is for the CD drive in a 933MHz 40GB iBook bought last December?

Drive info:

MATSHITA CD-RW CW-8123:

Manufacturer: MATSHITA
Model: MATSHITA CD-RW CW-8123
Revision: CA0T
Serial Number:
Drive Type: CD-RW/DVD-ROM
Disc Burning: Apple Supported/Shipped
Removable Media: Yes
Detachable Drive: No
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal

Thanks… have been having issues with burning at the wrong speed.