Speed characteristics
The spindle motor of the hard disk drives the disk to rotate at a high speed, generating buoyancy to float the head above the disk. To bring the sector of the data to be accessed under the head, the faster the speed, the shorter the waiting time. Therefore, the speed determines the speed of the hard disk to a large extent. The average hard disk speed of a household is generally 5400 rpm and 7200 rpm. The server user has high performance requirements on the hard disk. The SCSI hard disk speed used in the server is basically 10000 rpm, and even 15000 rpm, the performance is much higher than that of the household products. The higher speed can shorten the average seek time of the hard disk and the actual read and write time, but as the speed of the hard disk continues to increase, it also brings about negative effects such as temperature rise, increased motor spindle wear, and increased operating noise. The notebook hard drive speed is lower than the desktop hard drive, which is partly affected by this factor. The internal space of the notebook is small, the size of the notebook hard disk (2.5 inches) is also designed to be smaller than the desktop hard disk (3.5 inches), and the temperature rise caused by the increase in the rotational speed, which puts higher requirements on the heat dissipation performance of the notebook itself; the noise becomes larger. And must take the necessary noise reduction measures, which put more demands on the notebook hard disk manufacturing technology. At the same time, the increase of the rotational speed, while the other remains unchanged, it means that the power consumption of the motor will increase, the more electricity is consumed per unit time, and the working time of the battery is shortened, so that the portability of the notebook is affected. Therefore, notebook hard drives generally use a relatively low-speed 5400rpm hard drive.