The bouncy buffer is normal behavior for packet writing, and that’s exactly what should happen. Most drive controllers are onboard and “soft” so that they do not hold an entirely steady connection. Most computers aren’t attentive to the drive controller 100% of the time. Packet writing (to the buffer) eliminates errors. This is a very good feature. You’re seeing the entire 2 mb ram listed on the meter. The 2 mb is not entirely a read buffer, and the 85% part is an important write stage (maybe I remembered this backwards?). This is normal operation. Drives that do not show this behavior, as mentioned above, are still doing exactly the same thing, but just reporting a fraction of their ram on-screen to give a better show. That’s why the percentages differ in this case. If, in fact, a drive showed a consistently full meter, then it could not have been writing (emptying)–so it is only the show that differs.
See http://www.cdspeed2000.com for a free upgrade to Nero’s CD-DVD speed utility.
Scan your output to see if it is healthy. Compare it to scans in this forum.