Re: lock on thumbnails?
CDs come in many flavors, -R, +R, -RW, +RW, etc. and many of the CD readers will not read all the formats. DVD is just as bad. Most computer CD readers are better at reading all of the formats, MOSTLY, but all bets are off when you try to use the standalone units that connect to your TV or even the internal ones.
You need to know which format your clients CD reader will read and then your CD writer must be set to burn that type of disk. Its a nightmare! I have a selection of CD and DVD blanks of several formats and three different CD, DVD writers so I can write to a specific format. I also use Nero, NTI, Ulead, and Adobe Encore as writer software.
Good luck working out your solution.