My XT963 has an apparently bad CD-RW: noisy, vibrating, slow reads. The unit is under warranty. I can easily replace it myself if HP would just send me the CD-RW (I thought the warranty provided for replacement parts), but HP will not send just the drive. I could get it replaced at a local HP Service Center, but HP won't allow that on its KR series. The KR series is strictly a total unit replacement item! The unit HP shipped to me as a replacement, with my credit card as collateral, arrived defective (loose parts sliding around... read full review »