On 29/04/2016 2:25 PM, Richard Pope wrote: > Harold, >=20 > 40 C is hot to us and 45 C is very hot. Ambient is considered to be= =20 > 25 C. These are 104 F, 113 F, and 77 F in that order. It is interesting=20 > that the failure rate goes down at first. I still like to keep my=20 > electronics as close to 25 C as I can. As I have said before I now have=20 > drives that are over 10 years old. I run my systems almost 24/7. >=20 Hi Richard, Over the past 12 years I have found that a constant 25degC temperature environment for the drives works best - lost too many drives - and some data - to know. I don't power cycle my equipment, it's 24/7 temperature controlled. All runs smoothly. I read some of the drive failure report, but I'm with Richard on this one. Especially non-commercial set-ups, where the average person doesn't necessarily have their systems in an ambient controlled environment. I believe it's the temperature differential, power cycling, and maybe power failure, that all contribute to main drive / hardware failure. Peter --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .