What is the read and write speed of a 7200 rpm hard drive?

The read and write speed of a 7200 rpm desktop hard drive is: 90-190MB per second; the continuous read and write speed of a 7200 rpm mechanical hard drive is generally 150MB-200MB per second. But the actual situation may be different. There are many factors that affect the speed of the hard disk. For example, AHCI mode is faster than IDE mode, transferring a single file is faster than transferring multiple files, SATA3 interface is faster than SATA2 interface, etc.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

7200 RPM desktop hard drive: 90-190MB per second; 7200 RPM mechanical hard drive's continuous read and write speed is generally 150MB-200MB per second.

The reading and writing speed of the hard disk is mainly determined by the rotation speed: the continuous reading and writing speed of a 5400-rpm mechanical hard disk is generally 100MB-150MB per second, and the continuous reading and writing speed of a 7200-rpm mechanical hard disk is generally 150MB. -200MB per second;

The actual situation may be different. There are many factors that affect the speed of the hard disk. For example, AHCI mode is faster than IDE mode, transferring a single file is faster than transferring multiple files, and the SATA3 interface is faster than SATA2 Interfaces and so on.

There is a certain relationship between rotational speed and reading speed, but it is not certain. The speed of the same two hard drives may be different. You can only know the speed of 7200 rpm 2.5-inch and 3.5-inch by testing. They are also different, even if the same brand is different.

#Why is the hard disk speed such a strange number like 5400 or 7200?

First of all, we need to clarify what 5400 RPM means: RPM (revolutions per minute). It refers to the rotation speed of the motor spindle in the hard disk, which is the maximum speed that the hard disk platter can complete in one minute. Number of revolutions.

5400 rpm means that the motor driving the disc chooses 5400 rpm per minute. Note that this is minutes and not seconds.

Where did 5400 come from? Let’s start with its father, 3600. In the first 10 years after the birth of the PC, almost all hard drives had 3600 rpm. Where did this 3600 come from? Because the AC power in the United States is 60Hz!

You may be surprised that there seems to be no relationship between 60Hz and 3600. The secret is hidden in 1 minute:

1 minute = 60 seconds

60Hz × 1 turn/ Hz × 60 seconds/minute = 3600 rpm

It’s clear. What about 5400 and 7200?

5400 RPM = 3600 RPM × 1.5

7200 RPM = 3600 RPM × 2

Tradition is powerful, even though the PC's hard drive is not used AC, but the original design drew on the design of AC motors, and the first generation PC also used the 3600RPM parameter. Once a thing is born, it has its own life and survival logic. 3600 RPM also gave birth to children such as 5400 RPM and 7200 RPM due to reasons such as tradition and laziness.

Extended knowledge: Which one is faster, 5400 RPM or 7200 RPM?

Hard drives are divided into mechanical hard drives (HDD) and solid-state drives (SSD). Mechanical hard disk is a traditional ordinary hard disk, which is mainly composed of: platter, magnetic head, platter shaft and control motor, magnetic head controller, data converter, interface, cache and other parts.

The magnetic head can move along the radius of the disk. Coupled with the high-speed rotation of the disk of several thousand revolutions per minute, the magnetic head can be positioned at a designated position on the disk to read and write data.

The single-disk capacity of disks is constantly improving. The increase in single-disk capacity means an increase in storage density. It is difficult to say which one is faster, 5400 rpm or 7200 rpm.

Let’s give an example to illustrate. The same generation of 5400 rpm 200GB Toshiba hard drive and 7200 rpm 100GB Hitachi Travelstar hard drive. The 5400 rpm read and write speeds are as follows:

roughly 25MB/s read and 39MB/s write. And what about 7200 rpm?

Writing speed is 25% faster and reading speed is almost doubled! This shows that under the same density, the speed of 7200 rpm is much higher than that of 5400 rpm. What about the different storage densities?

The read and write performance of Samsung's 5400 rpm 1TB SpinPoint hard drive is as follows:

It can be seen that with the increase in density, the Samsung 5400 rpm hard drive is several times better than The read and write speed of the 7200 rpm hard drive more than doubled a year ago!

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