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2. Hard disk drive performance characteristics - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive...

   On SCSI hard disk drives, the SCSI controller can directly control spin up and spin down of the drives. Some Parallel ATA (PATA) and Serial ATA (SATA) hard disk drives support power-up in standby (PUIS): each drive does not spin up until the controller or system BIOS issues a specific command to do so. This allows the system to be set up to ...

3. Spin-up - Wikipedia

   en.wikipedia.org/wiki/Spin-up

   Staggered spin-up (SSU) was introduced into SATA revision 2.5 in 2005. [2] SSU allows a SATA host bus adapter to spin up hard drives in a sequential manner. [3] In SATA 2.5 and above, the drive starts without spinup if the "disabled stagged spinup" (DSS) pin (standard power connector pin 11) is left floating.

4. Optical storage media writing and reading speed - Wikipedia

   en.wikipedia.org/wiki/Optical_storage_media...

   In order to market increasing drive speeds, manufacturers used the symbol n×, whereby n is the multiple of the original speed. For example, writing to a CD at 8× will be twice as fast as writing onto a disc at 4×. [2] There are two main types of disc speed, which are the angular and linear velocities.

5. Revolutions per minute - Wikipedia

   en.wikipedia.org/wiki/Revolutions_per_minute

   Computer hard drives typically rotate at 7500 rpm – 10 000 rpm ... A supercharger can spin at speeds between or as high as 50 000 rpm – 100 000 rpm (833 Hz ...

6. IOPS - Wikipedia

   en.wikipedia.org/wiki/IOPS

   Please do not remove this message until conditions to do so are met. ( August 2016 ) ( Learn how and when to remove this message ) Input/output operations per second ( IOPS , pronounced eye-ops ) is an input/output performance measurement used to characterize computer storage devices like hard disk drives (HDD), solid state drives (SSD), and ...

7. Head crash - Wikipedia

   en.wikipedia.org/wiki/Head_crash

   Since most modern drives spin at rates between 5,400 and 15,000 RPM, the damage caused to the magnetic coating can be extensive.At 7,200 RPM, the edge of the platter is traveling at over 120 kilometres per hour (75 mph), and as the crashed head drags over the platter surface, the read-write head generally overheats, making the drive or at least parts of it unusable until the head cools down.

8. Disk storage - Wikipedia

   en.wikipedia.org/wiki/Disk_storage

   A hard disk drive contains a set of platters. Developments in optical technology have led to multiple recording layers on DVDs. Spindle the spinning axle on which the platters are mounted. Rotation Platters rotate; two techniques are common: Constant angular velocity (CAV) keeps the disk spinning at a fixed rate, measured in revolutions per ...

9. Talk:Hard disk drive performance characteristics - Wikipedia

   en.wikipedia.org/wiki/Talk:Hard_disk_drive...

   *On SCSI hard disk drives, the SCSI controller can directly control spin up and spin down of the drives. *On [[Parallel ATA]] (aka PATA) and [[Serial ATA]] (SATA) hard disk drives, some support [[power-up in standby]] or PUIS. The hard disk drive will not spin up until the controller or system BIOS issues a specific command to do so.