The transmission speed of mechanical hard disks, that is, the writing speed and reading and writing speed, is generally about "120MB/S". The speed of SATA protocol solid-state hard disks is about "500MB/S". Mechanical hard disks are mainly composed of platters and magnetic heads. , disc shaft and control motor, head controller, data converter, interface, cache and other parts.
The writing speed and reading and writing speed of mechanical hard disk are generally about 120MB/S, the speed of solid-state hard drive with SATA protocol is about 500MB/S, and the speed of NVMe protocol ( The SSD speed of PCIe 3.0×2) is about 1800MB/S, and the SSD speed of NVMe protocol (PCIe 3.0×4) is about 3500MB/S.
Mechanical hard disk is mainly composed of several parts such as platter, magnetic head, platter shaft and control motor, magnetic head controller, data converter, interface, cache, etc.
Extended information
Hard disk capacity: Hard disk capacity is measured in megabytes (MB) or gigabytes (GB), 1GB=1024MB, 1TB=1024GB. However, hard disk manufacturers usually use 1G = 1000MB when nominal hard disk capacity, so the capacity seen in the BIOS or when formatting the hard disk will be smaller than the manufacturer's nominal value.
The capacity index of the hard disk also includes the single disk capacity of the hard disk. The larger the capacity of a single disk, the lower the unit cost and the shorter the average access time. The mainstream hard drive is 500G, and large-capacity hard drives above 750G have also begun to become popular.
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