Dear Friends,
First of all I wish all of you a Happy New Year.
I again turn to you for help again with a PLEXTOR DVD writer
(Model#: PX-716A) a replacement of an earlier one, same model. Then I did dvd's but it did not write cd's.
Now it is vice versa, it does cd's but not dvd's, always witn Convert X to DVD.
Could you help please? Is it a software or hardware problem do you think?
Thanks a million.

The error message:

7/1/2008 5:18:43 mm information Media removed. Burning layer not ready to write
7/1/2008 5:18:31 mm error Write error at 16 (16) - Code 05 24 00 [Illegal request, Invalid field in CDB]
7/1/2008 5:18:31 mm information Lead-in burning time (mS) 0
7/1/2008 5:18:06 mm information Write started 1367568 sectors to write
7/1/2008 5:18:06 mm information Writing speed requested x4.0, effective x4.0
7/1/2008 5:18:06 mm information Available write speed: 16x, 12x, 8x, 6x, 4x
7/1/2008 5:18:06 mm information Media ID: RICOHJPN-R03-04
7/1/2008 5:18:06 mm information Media type: DVD+R
7/1/2008 5:18:06 mm information DMA Mode
7/1/2008 5:18:06 mm information Scanned files #8, folder #2 - total size 2799663104 b. (2,61 Gb.)
7/1/2008 5:18:06 mm information Inserted media type : DVD+R
7/1/2008 5:18:06 mm information Write started
7/1/2008 5:18:06 mm information Media name: "02 Jacob And Jesse"
7/1/2008 5:18:06 mm information Burned folder: "F:\MOVIES\ConvertXtoDVD\02 Jacob And Jesse"
7/1/2008 5:18:02 mm information New media inserted. Burning layer is ready to write
7/1/2008 5:18:01 mm information Compatible media types : DVD-R, DVD-RW Seq., DVD-RW RO, DVD+R, DVD+RW, CD-R, CD-RW, DL DVD+R, DL DVD-R
7/1/2008 5:18:01 mm information New Drive selected : 4:1:0 - PLEXTOR DVDR PX-716A 1.09 [E] (Ide)
7/1/2008 5:17:50 mm information New media inserted. Burning layer is ready to write
7/1/2008 5:17:47 mm information User default language : 1032 (0x0408h) - Greek
7/1/2008 5:17:47 mm information System default language : 1032 (0x0408h) - Greek
7/1/2008 5:17:47 mm information Version 2.2.3.258
7/1/2008 5:17:47 mm information ExeName : "C:\Program Files\VSO\ConvertXtoDVD\ConvertXtoDVD.exe"
7/1/2008 5:17:47 mm information OS : Microsoft Windows XP Professional Service Pack 2 (Build 2600)
7/1/2008 5:17:45 mm information ******************** Report session started ********************

Could be a software issue, have you tried Burrrn for making cd's? Maybe trying a different software to burn the dvd like Imagburn might help?