I burn and need to read a lot of DVD's and the removal of the optical drive I consider to be a big mistake. Regardless, I purchased an LG external writer that can write DVD's at 24X because all the other drives were limited to 8X. Unfortunately, using either Burn or Premiere Elements to burn a disc, my speed is limited to 4X which is pretty unacceptable. Anyone have any suggestions? Is this totally a limitation of the software, or the iMac?