Hello, I have a Toshiba Dvd-cd burner, SD-R5372, which on more than one occasion, will burn certain ‘brands’ of disks at only 4x. I usually get Verbatim, or Imation Dvd-r’s, which will burn at 8-16x or greater, but today I bought Magnavox, Memorex, and Staples in store brand dvd-r’s and they will only burn at 4x, although they say they will burn at 16x. I use Nero(updated) to burn with. I also updated the firmware also. This is an irritating problem as many of you know. I get the Verbatims/Imations when they are on sale, and those are fine, but the others should work at higher speeds too. Thank you for any tips, tricks, suggestions on this problem!