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This is in the context of data not being flushed from the disk cache during a power interruption. If I power down a PC by holding the power button, will any disk caches flush themselves since there is still power? Or does ACPI make it function as if the power was immediately cut?

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Holding the power button forces a main supply cutoff, but leaves standby power on. Since drives do not have access to standby power, the result is the same.

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