I have a toshiba SD-2800 and a Panasonic DVD-RV32. For my VCDs, I always used Memorex 80 minute 24x multispeed, and never had a problem. Now, all I can find is 40x multispeed or more, and for some reason, they won't work in either of my DVD players. Any reason why, or suggestions on what CDs to use? I am using a Yamaha 24x writer. Thank you.