It is possible that DMA has been turned off for the drive if it is a regular IDE interface drive. That probably sounded like Greek, but it is a pertinent answer I assure you.
Tell us the exact model LG that you have. We will then be able to tell if it is an IDE interface or SATA. You can find this information by going to My Computer, right click on the drive icon and choose Properties. Then click on the Hardware tab. The name of the drive should show up there.
If DMA is off, the drive will not burn properly and may have issues on playback also. Look in my signature for a link that refers to Womble's guide for checking DMA. Click on the link and follow the instructions in that guide. The most important part to look for is Current Transfer Status. It should be Ultra DMA 2 or 4....NOT PIO mode.