Instruct: Classify the given review into positive or negative sentiment.
Query: defected hardware

I purchased a SZ160P last week, and the CD/DVD drive malfunctioned on the fifth day. It made strange noises when a CD was inserted into the drive, and could no longer burn CDs. The hypernation mode also malfunctioned, according to the Sony technician with whom I had an extended telephone troubleshooting session. It is unfortunate that such an expensive machine does not have better quality control. I wouldn't recommend it for that reason. Also, the AC adaptor is quite heavy and very bulky.