utility to determine max write speed for CDR?

i'm pretty sure i've used a tool before to determine the max speed a CDR can be written. i thought is was part of nero, but i can't find it. doing a search on "max cdr burn speed" pretty much returns every post on here. so, is there a utility to read a blank CDR and show what the max write speed is? btw, i have a liteon CD-RW and sony DVD+-RW. thanks.