Problem with reading Dual Layer DVDs.

I've a normal iBook G4 with a combo drive (it's the 1 Ghz model) and when I insert a dual layer dvd which I've made on another computer at school, the drive in my iBook won't read it (as in it spits it out). I was wondering if this problem extends to everyone else with a similar model/drive.
The media I used is a TDK DVD+R dual layer disc. The drive has had a problem reading a dual layered DVD-R; the problem being that it could only read (possibly) only one layer of the disc.
Is there a firmware update that can applied to rectify the problem?

Hi and thanks for your reply.
I'm actually not sure if I can read commerical dual layer DVDs, but the fact that the DVD was pressed and not burnt, and that the DVD is released for commercial purchase has lead me to believe that my drive can read the DVDs.
Also backing up my drive's ability to read dual layer DVDs, as mentioned in my previous post, is that it could read parts of a DVD-R dual layer DVD. What I meant by parts, or, just one of the two layers, is that the dvd contains a folder which houses 4 gigabytes of data, or about half the DVD. The contents within this folder can be copied to the hard drive, whereas the content on the root of the DVD can not, causing the drive to continually spin the disc, making the "trying really hard to read" noise, forcing me to restart the computer whilst holding the mouse button in order to get the dvd out.

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