I have a P-III, 500Mhz. I have a Samsung CD-ROM Drive Samsung CD-ROM SC-152B. It used to run fine until I also installed a Samsung CD-R/RW drive. Now my CD-ROM drive has become so slow that it cannot transfer data unless DMA is enabled on that drive. My vendor says that there is no problem with either drives. But the CD-ROM drive has become very slow. I have used lens cleaner but without any result. Also when a CD is rotating in the CD-R/RW drive, somtimes it stops with a screeching sound. Please advice me what should be done to speed up the drive.