Am 04.12.2014 04:02, schrieb Jon Elson: > /snip > Yes, of course, various manufacturers test all sorts of > stuff! But, these PUBLISHED > MTBF numbers all seem to come from the old DESC scheme. > When they show > 250K hours MTBF for a hard disk drive, you KNOW they are > using this methodology. > Anybody know of a hard disk drive that will run for a > continuous 28 YEARS? > NOT very likely. > At the company I was working for, I had a building management system installed (don't want to mention the brand, sounded like Siemens) around 1980. The central processor unit contained a hard disk drive with a - nowadays - ridiculous sounding capacity of, say, 100 kbyte. There was one aluminium disk of about 30 cm diameter inside, we could see it turning through the plexiglas cover. The device was the size of a large drawer, weighing about 50 kg, and ran continously without failure (and without back up system) up until we switched it all off to make room for a more modern system. The disk made it more than 30 years without repairs. The new system is PC based and the computers must be replaced about every two or three years.
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