Clicking sounds during DVD back-up playback

Hello all,

Whenever I play a DVD back-up in my standalone DVD player, I notice a distinct ‘clicking’ sound. There’s absolutely nothing wrong with the picture or sound: the disk plays perfectly. Could this be indicative of a ‘bad burn’ and could this be detrimental to the player? This doesn’t happen with the original DVD-ROM. I will slow down the write speed next time to see if it makes any difference, but was wondering if anybody else has experienced the same thing. Below are a few more details about the setup…

Standalone: Toshiba SD-220E
DVD Writer: NEC 3500AG
Media Type DVD+R
Media code/Manufacturer ID: YUDEN000T02 (FUJI)
Book Type DVD-ROM
Write Speed: 16x