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Create optical notches around the edge of
the platter that align with data bits on the
platter to sync with, then allow drives to
vary between say 3000 RPM (near idle, but
enough for the air cushion) to 15000 RPM
based on data rate demand (and I suppose
inversely to bad conditions like heat
Heads could read continuously (once RPM
is greater than float speed), which would
also shave a few seconds off boot time,
not having to wait for spin-up. Ideally, this
should be buffer through RAM and a flash
Flash 'parititon' getting used, but nothing
committed, hdd spins down completely to
save power. RAM is unused to save power.
Flash 'partition' is getting near capacity,
but not at an alaming rate, start drive at
near-idle speed (3000 RPM), read write to
relieve data growth rate. RAM is still
Flash 'partition' getting used very heavily,
data growth will exceed space. Kick speed
up as needed to maintain flash room. RAM
begins caching what the flash can't hold
and the HDD has yet to write.
It's called a "hybrid disk drive" and Windows Vista will already have support for them. [NoOneYouKnow, Jun 08 2006]
||A variable speed disk? Like all CD-ROM drives? Or notebook hard drives?
||Samsung has already announced a hybrid drive combining flash with standard hard drive technology. Windows Vista is supposed to release with support built in.
||Changing the speed (particularly, speeding it up), requires *more* power, and depending on how quickly you want it to gain speed, a *lot* more power.
||When a drive is in a steady state, you're only overcoming friction. When accelerating the spindles, you're also adding kinetic energy (angular momentum).
||The net result is that you're better off spinning at a constant speed than constantly changing.
||Portables should have clockwork hard-drives.
||well, I think if you made an iphone app that used the accelerometer to record the moves of street performers spinning n break dancing at 90s revival fests you could graph their RPM as well as trueness to form, then upload it to the cloud live, which would be like spinning flash memory.
||//Changing the speed (particularly, speeding it up),
requires *more* power//
||So, why not provide hard drives (particularly for
battery-powered devices) with regenerative braking?
||//regenerative braking// a spring; every time you restart the drive after stopping it, it spins in the opposite direction as previous.