Spindle Motor Power Usage at Spin-Up
Most of the power used by a modern hard disk drive is taken up by the spindle
Hard drive manufacturers generally program their drives so that when two are used on the same IDE channel as master and slave, the slave drive delays its spin up by several seconds to offset its start from that of the master drive, and reduce the peak demand on the power supply. Similarly, many SCSI drives can be programmed to delay their startups, using the “Remote Start” command or a special jumper. These features offset the time that the drives spin up to reduce the peak demand on the power supply.
Another issue with spin-up relates to boot speed. In order for the system to boot up properly when it is turned on, the platters must be brought from a standstill to operating speed in a relatively short period of time. Modern PCs often have “expedited” BIOSes that go from power on to attempting to boot the hard disk in only a few seconds. If the disk isn’t ready, often the system will hang, even though it will boot if you press the reset button and start the boot process over again. Some system BIOSes include a delay feature that can be used to slow down the boot process to avoid this problem. Otherwise, slowing down the boot process by turning on the memory test feature, for example, can sometimes cure this problem.
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