99min cd-r media
 

Nero 6 and Pioneer dvd-rw dvr 109 did not reconize the 99min cd-r I put in. Why?

it is normal that these kind of cds are recognised as 90 minutes or even 80 minutes recording time.
just go into the expert options in nero, check 'enable overburn of CD-R' (or similar) and set overburning to 98:59:74.

this should do the trick.
when burning, tick the box 'simulation'. this will make sure you won't end up with an unreadable disc.