< That, is not the HD heat problems...cooling air was poorly done in < both installation and case design. Old Compaq Deskpro cases have < that in mind. ST225 got real hot too so need to watch that on any < 5.25" hds and insure cooling is good. Amen to that. Heat is a bad thing for computers or their peripherals. Most suffer from to much heat, and too much heat around the disk stack. < Those ST251's have rapidly died out around here, Actually I'm still running one, in a Leading Edge model D Xt box that does cool exceptionally well. The power supply (and the fan in it) is behind the disk stack and exceptionally well cooled. I put a second fan in the 486/66 for that reason... to hot. The altair taught me well about heat... and lousy air flow. Allison