Does my iMac have a dual layer burner?

Question

I'm trying to burn a 155 minute dvd. I only have 120 minute blank dvds.
I'm told I need to buy dual layer dvds but this will only work if I have a dual layer burner.
I have a PIONEER DVD-RW  DVRTS09.
Am I good to go?

Answer 1

The best way to find out if you have a Dual Layer DVD Burner, is to click  then "About This Mac" then Click on More Info, then in the new System Profiler window, on the left hand side select "Disc Burning". Youll be presented with something that looks like this (This is from my 24-inch Late 2006 iMac):
OPTIARC DVD RW AD-5630A:
  Firmware Revision:          2CH9
  Interconnect:          ATAPI
  Burn Support:          Yes (Apple Shipping Drive)
  Cache:          2048 KB
  Reads DVD:          Yes
  CD-Write:          -R, -RW
  DVD-Write:          -R, -R DL, -RW, +R, +R DL, +RW
  Write Strategies:          CD-TAO, CD-SAO, CD-Raw, DVD-DAO
  Media:          To show the available burn speeds, insert a disc and choose View > Refresh
What you'll be looking for here, in the DVD-Write section which I've bolded and underlined for quick spotting, if you have -R DL and/or +R DL, those are Dual Layer DVDs that you can write to.
***Be careful as some Macs shipped with Dual Layer Drives (MATSHITA Brand) that only burned +R DL Dual Layer DVDs, meaning you CANNOT burn -R DL Dual Layer DVDs. So make sure you verify that your drive supports the dual layer DVDs that youll be purchasing before you go to the store.