I don't get it -- help please

[arichi]

When I burn a CD full of Data MP3s, sometimes my MP3-CD player says "no disc" after I put that CD in. Any ideas why?

[I'm using WinXP's native burn - didn't find a copy of Nero for this machine, maybe I need to do that. And they're Office Depot CD-Rs, but some ODCD-Rs are working]

Help please :)