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The difference between a 5400 and 7200 rpm hard drive


The hard drive is one of important hardware of a computer and is where computer files and programs are stored. The evaluation index of a hard drive, in addition to its own capacity, is rotational speed of its internal motor-spindle, which we usually call speed of hard drive. RPM determines speed of hard drive.

Currently, there are only two common keyboard speeds on market, namely 5400rpm and 7200rpm, and most commercial models use 7200rpm, so what are advantages of 7200rpm hard drives compared to 5400 rpm hard drives? do most business models have 7200 rpm hard drives?

The difference between a 5400 and 7200 rpm hard drive

Hard disk rotation speed is one of key factors that determine internal data transfer rate, which largely directly affects user's daily data storage. Thus, higher rotation speed, faster hard drive can find files, which means higher transfer speed. In more detail, most of mechanical hard drives currently used in laptops are based on a spindle motor that spins drive at high speed to create buoyancy so that magnetic head floats above drive. head, faster rotation speed, shorter waiting time, which means highly efficient operation.

Generally speaking, 7200 RPM hard drives definitely improve computer performance to some extent compared to 5400 RPM hard drives. The faster hard drive, higher power consumption and heat dissipation. With same configuration as laptop, temperature of 7200rpm hard disk is higher than that of 5400rpm hard disk, and read and write speed is also faster. Compared with 5400rpm hard disk, 7200rpm hard disk can better meet needs of users in terms of transfer speed.

For a 7200 (rpm) hard disk, time required for one revolution is 60×1000÷7200=8.33 milliseconds, then average rotation delay time is 8.33÷2=4.17 milliseconds (average it takes half rotation lock). According to same calculation method, for a 5400 (rpm) hard disk, average rotation delay time is 60×1000÷5400÷2=5.56 milliseconds. Compared to two, 7200 rpm is theoretically 15% faster than 5400 rpm, but actual speed is only less than 10% faster than latter, far from one-third expected by many people.

Editor output: According to hard drive trend, we should use a 7200 rpm hard drive. As for noise, friends who like silence are advised to choose a low-speed hard drive. . The speed of a hard drive is basically proportional to noise, higher speed, louder noise. Those with financial ability can buy SSD hard drives.