Hi there,
I've got an Artmedia Rewritable CD CD0RW74C but don't know what the maximum write\re-write speed?

The label says 4X, but it's not specific?
Is this the max writing speed or is it the re-writing speed?

Is there an app that can determine the media type?

Thanks in return,

If it is a 4X CDRW then it is a 4X CDRW... Write and rewrite speed will be the same.

If you use Nero it will detect the max write speed of the media.