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Our late lamented D02 was powered down most of the time, but kept plugged in. It wasn't kept on a UPS, and the internal UPS was long gone (and physically removed). On two separate occasions, both shortly after a power failure had occurred after a prolonged period without a power-up, it went into system password bypass. We found that we could extend the bypass period by keeping the system powered down as much as possible.The D02 may have had a bad cache battery.
We have 3 boxes that only get occasional use, and all of them are on a weekly exercise cycle, both to keep the drives limber, and to keep them from going into system password bypass.The exercise trades off some motor life (startup load) for stiction avoidance.
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