Every time I put in a blank CD-R (I've tried with multiple discs), I hear the drive whir for a few seconds, stop, whir again, and stop again, and then the CD is ejected. This only happens with blank CD-Rs. I've tried CDs that I have burned with this drive itself in the past, and it happily reads them. No window pops up asking what to do with the blank CD, it just ejects it without asking. Any thoughts?