Dimitry Sibiryakov wrote: > 26.10.2011 8:58, Alex Peshkoff wrote: >> Probably I've missed some details. Capacitor present on HDD is really >> enough only for making sector's writes atomic. A solution with capacitor >> to save cache somewhere requires additional flash RAM - in that case not >> too big capacitor is enough to save write cache data to NVRAM. When >> power is back again, contents of the flash is will be stored on disk. > > Don't forget about the energy from rotating. In old HDD it was enough for > heads' > parking. In modern models it may be enough for cache writing as well. > The problem with using the energy from rotating to write data is as you remove the energy the rotation slows so it is not possible to write as the disk slows down.
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