I agree with you zevia. :iagree:
But, our DVDRW drives are far too primitive for any adequate jitter measurement.
Few additional notes;
Jitter measurement discribed in ECMA-349 (here with working link) are done at "reference velocity", ie. 3,46m/s (1x) and with a setup of equipment as described in figure D1 (annex D, p.93).
None of these conditions can be met by our drives.
What should I do if my jitter (max) is above 12.5%?
The best is to run a transfer rate test at highest possible speed. If CD/DVD Speed shows an even graph all the way to the end of disc, then there is nothing to worry about.