It's been 6 months since I used 2 of these intensively discs (server-use machine on 24/24 & 7/7), I have found no fault. I launched an extensive search after receipt of defective sectors that showed no errors. The discs are ideal for use (storage), reads / writes by Sata II are fast (about 90 MB / s on average), the 5400 rpm does not seem noticeably slow file transfers. Very little noise for use (it is possible to sleep in the same room as the machine, and I am a light sleeper). An old hard drive installed only made him more noise than the other two met during a file transfer. From my experience, HD204UI are reliable, consume little, are silent and have the price per GB weakest market.