Nero Drive Speed doesn't work on all Drives

Can anyone care to explain to me why Drive Speed can adjust the DVD READ speed of ONLY some DVD drives?

I tried four different Drives (Pioneer 109, Plextor 716, Liteon and NEC 3550a) and it only worked with NEC drive. Other three I couldn’t adjust the read speed down.

Is there any other way?

Thanks.
D.

Because some drives are locked in firmware. To unlock them you need to modify firmware (for example, with omnipatcher for liteon drives)

This totally make sense! Do you know where I can get these patched firmware?

For liteon drives you can see here.

For NEC drives you can check here

For pioneer, sorry I don’t know :frowning:

Thanks for the links…I will try them out.