CD burning speed in ibook2

[Nirmal Govind]

I was trying to burn some audio files onto a CD-R from my hard disk
using
xcdroast. The speed it was showing was around 4X while the writer is
supposed
to write onto CD-R's at 16X and CD-RW's at 8X.. is this a limitation of
the
xcdroast or is there some other setting I need to tweak beside setting
the read
and write speeds in xcdroast?

Thanks,
nirmal