I've just begun having major CD burning problems since I switched mainboards. The Pioneer DVR-212D's, in conjunction with my Intel BadAxe2 mainboard (using the Intel SATA controller in AHCI mode) are giving me tons of coasters in Nero 6.6. This is even at slow burn speeds (16x, 10x). I haven't had problems with DVD's so far, though I haven't burned as many, but I'm still unsure as to the cause. Nero's read buffer just instantly drops to zero at a random point during the burn, and then fails. I'm running 6.6.15, it's a brand-new install.
I may connect the drives to the secondary Marvell controller to see if this helps the problem, but right now, I don't have a clue as to why they read already recorded discs fine, and seem to do DVD's fine, but have CD problems. I'm using Verbatim silver-top inkjet-printable discs; I may need to find another brand of discs and see if that helps, though they've not been a problem before.
Barring that, I may need to return to an IDE DVD-ROM/IDE DVD-burner setup. We'll see what goes.
EDIT: Defragged the disk, hasn't solved the problem, and it happens on both burners, even after I've replaced their SATA cables. I'm loath to put Nero 7 on to see if it fixes things, since burning was fine with my old nForce4 mainboard (though I did more DVDs than CDs, *shrug*). I did attatch the burners to the Marvell controller, but that causes more issues, as the Marvell drivers treat the controller like a SCSI controller, so I went back to the Intel side.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890