[qanda]This question is published in the hardware section for the LG GH22L. Click here to view full specs.[/qanda]With this drive (LG GH22L) I can only read DVD R (tried different vendors) only at 3.5x (max 4x), both on WinVista and WinXP. My other device (an old LG) reads at almost 16x.
Ensure that your LG GH22L Drive (and all other IDE devices) is operating in the DMA Mode.
Suggest reviewing the below Forum posting for details ->
I have exactly the same problem with my drive that I bought yesterday! The DMA is enabled and still the drive reading speed is only up to 4x. It writes normally though.