I usually use "DMS" DVD+R DL media for back ups. (2005 PAL machine )
I've never got a problem since i try to flash my hitachi to extreme 2.3
(Restored first , restarted everything and Flashed 2.3)

Now It isnt reading some of my games.
But Always reading Philips and Memorex.

Which games on DMS worked?
* Tony H 8
* N3
* Just Cause
* FIFA 07
* PES 6
* Crackdown
* RainbowSix Vegas

Not Worked on DMS (Working before flashing)

* Lost Planet
* Gears of War
* Dead Rising
* NFS Carbon
* Test Drive
* Smackdown 2007
* Splinter Cell Double Agent
.etc.

NOTE: Philips and Memorex are working good. (I was using Extreme 1.3 with no problems flashed on the same Pc.)

I have over 30 games on DMS How can i burn them all to Memorex or Philips ?

First: Wrong forum. Should be in "Xbox360 Backup Forum - DVD DL help / ISO Building"
Second: Use the originals to burn like you did the first time, just on the different media

agreed, time to rip again from original,
moved
soso

In addition DMS media tells us nothing. Who really manufacturers these? Read the first link in my sig for more info.