I think i have an answer…
"This MCC01RW4x disc are DVD-RW 4X disc and cant be written higher than 4X : it’s simply impossible
for a RW disc.
Try to update your ala42 MCSE here http://ala42.cdfreaks.com/MCSE/
I think it’s a bug, contact ala42.
PS : not that OS is only for SL +R/-R discs. Not for DL, not for RW."
"I take a look at the changelog on http://ala42.cdfreaks.com/MCSE/ and this point could explain both point :
22.214.171.124 26 Nov 2005
- fixed bug displaying wrong speed values for -R MIDs without strategy
Maybe this -RW 4X is using a default strategy and 6X,4X is a displaying bug for
2X, 4X… "