We have a Dell Precision T1500 that we are running the Dell diagnostic partition on as we have had some strange errors lately. The test has been running for 8 hours. It's been creeping along. It started the hard drive read tests last, and it's been going up like 1% every 45 minutes. For example, it was at 88% 3 hours ago and now it's at 96 %. It is going up, but taking a LONG time. It has two 500GB hard drives in a RAID 1 configuration. It hasn't thrown an error yet, but seems like it's been going for a LONG time. We make have to cancel the read test as the machine needs to be used soon.