On Wed, 2003-01-08 at 09:20, et wrote: > Hmmmm, since I have been a Diesel Tech for over 20 years (before computers, > and still am certified to teach it (and do for Mitsubishi/Caterpillar) I > would ask you to consider that it is not recommended to start and stop larger > diesels that are turbo powered
Good point, since turbo chargers are very high temperature parts. This equates to a very high temperature differential, which fits in nicely with what I was saying, plus you are combining high temperatures and stresses with a potential lack of lubricant, which I don't need to tell you results in catastrophic situations. > due to a couple of problems, on being the heat > transfer to oil that is not getting cooled in the turbo, and the other being > the wear when the motor starts due to a lack of oil under pressure. so in > fact, there are MANY large and small internal combustion products where the > manufacture recommends "minimizing" starting and stopping the motor as much > as possible, Primarily due to lack of initial availability of lubricant, which is again reinforcing my point, since we are talking about sealed bearings with regard to hard disks. With sealed bearings it's much more of a mileage problem than it is a start stop problem, as the friction surfaces are always lubed. > and that has a lot to do with why you might see a number of > diesel trucks at a rest area, where the drivers leave them at idle over > night. > We could also consider a comparison to Flourecent Lights. the amount of > electric power used to start the lights is greater that the wattage used to > keep them on, so if makes sense to "leave the lights on" rather than turn > them off each time you leave the room, if you are going to return to that > room in the next half hour. That's right if you are talking as you said about 30 minute power on/off cycles, but that's not really what we are considering. My thought is between a couple of hours to daily. > So, while there is no "hard and fast" or "written in stone" rule, this is one > of those areas that experience and good sense are the reasons people pay > for consulting and Service Techs. Hmmm..good point. :) > > Most of the time a drive fails not from it's controller electronics, but > > rather from sealed bearing failure. > In almost any manufactured item with moving parts, the moving parts will fail > before solid state components fail, (unless the Solid State components are > moving so much they to should be considered moving parts) Yes. <<<<<Snip>>>>>>>> > > I've been involved with hardware since the late 80's, and I still have > > hard drives operational from that time. They are not powered on 24/7. > what do you use a 10 meg hard drive for these days? or are we considering that > the 10 meg MFM hard drive and controller in that AST 8088 in the closet are > still working since we can plug it all up and still get it to boot and play > simcity (the original) in monochrome, without a mouse. (big stupid redneck > one tooth grin) IDE drives were being produced in the late 80's. Seagate was producing generic 40 meg ide's and I was at that time in charge of mass producing IBM clones for Computerland. When the first IDE host adapters became available for the ISA bus, that was about the time we started making machines. I have some drives from that time period. Sentimental reasons. When I got enough money, I bought a Compaq Deskpro 386/20e and managed to get a 100 meg drive installed. At the time, this was a cadillac setup. The first thing I installed on it was SCO Xenix; kinda like the champagne bottle against the hull of the ship. I also had dos games, but I ran them from 3 1/2" floppy. The drive I had in the machine was a Conner Peripherals OEM drive, model number on the top is H100386S-P. Chipset is dated 1989; I keep it around so that I can remember what SCO Xenix was like. :) --LX -- ��������������������������������������������������� Kernel 2.4.18-6mdk Mandrake Linux 8.2 Enlightenment 0.16.5-11mdk Evolution 1.0.2-5mdk Registered Linux User #268899 http://counter.li.org/ ���������������������������������������������������
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