Older CDROM drives cannot read CD-RW...typically those from before 2nd quarter 1998. I am not aware of any software patches to correct this in these older drives (?). Newer hardware (CDROM) will correct this. Yes, the two media are read differently. Martin Kurr email [log in to unmask] > From: Stephen SL. Lo[SMTP:[log in to unmask]] > Subject: [PCBUILD] Format of CD-R and CD-RW? > My CD-ROM drive can read data in a CD-R disc perfectly but it cannot > read anything in a CD-RW disc burned from the same CD-RW drive. Dose > CD-R and CD-RW Disc has different format? How could I make my CD-ROM > reading both? Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://nospin.com/pc/pcbuild.html