Use these in the new HP Vectra's at work, love em, not sure about heat but as some of you know vectra's have next to no cooling in them. Also the SCSI models do get really HOT, but the'll live through it, I wouldguess seagate knows about the heat from testing and the circuitry is tolerane, Have 4 of the SCSI ones, running from 4 years straight to 2 years straight, ne'er an issue with em. These drives are fast and very quiet. Bump for my favorite drives ever.