7200vs5400 hard disk this difference is you really clear?

There is a small message on the weekend to buy a hard drive for advice. Can not help but let Xiao Bian think of an important topic, it can be regarded as a cliché - hard drive really buy 5400rpm or buy 7200rpm? What is the difference between them?

Hard disk speed come from?

The rotational speed of the hard disk is actually provided by the motor-driven spindle in the hard disk, which is simply a motor. It drives the platter to rotate, and then reads and writes data in conjunction with the head arm swing (seeking). The speed at which this motor rotates is the speed of rotation. Theoretically, the more revolutions per minute, the faster the speed of reading and writing files. However, this is only a theory.

How long does it take to go around?

I am afraid that few people know this interesting question? Let's talk about the result first

For a 5400rpm hard drive, the required time for each turn is:

60×1000÷5400=11.11 ms

7200rpm hard drive, the time required for each turn is:

60×1000÷7200=8.33 ms

In terms of speed alone, the 7200rpm is at least 15% faster than the 5400rpm hard drive. Of course, this is just a digital game.

Where are the advantages of high speed?

The faster the speed, the part that best reflects the performance gap is not continuous literacy but random reading and writing. And this gap is quite obvious. For example, a 7200rpm hard disk has a 20% advantage in random read/write capability than a 5400rpm hard disk, but for continuous read/write capability, a 10% gap is good - don't forget, There is no difference between the seek ability of the head arm, and the use of the disk does not change quickly.

Low speed also has strengths

Take the 7200rpm and 5400rpm hard disks for example. The former has a speed of 1800rpm more than the latter. High rotation speed means higher heat, more power consumption, and more noise. This physical property cannot be changed. This is why a lot of monitoring hard disks can only achieve the root cause of 5900rpm, and this is also the root cause of many 7×24-hour mechanical hard disks that are manufactured with low-speed design (low heat generation, low power consumption, and high stability).

Therefore, the advantages of current high-speed mechanical mechanical hard disks are not obvious, especially the popularity of SSDs. Mechanical hard disks are more responsible for the role of data warehouses, and the contents of storage are mostly large files. The test is only continuous literacy. , 7200rpm hard disk quite a bit of heroes useless.

Buy hard disk to pay attention?

In fact, in addition to speed, mechanical hard disk should consider the two indicators of the cache, the number of platters. In particular, the larger the capacity of a single platter (the density of platters), the cache should match it. At present, many mechanical hard disks with a platter capacity exceeding 1 TB are all matched with a 128 MB cache, and even a lot of laptop hard disks with a higher density (2.5 inches The single platter 1TB) comes with 256MB of cache.

The second is the number of platters. The higher the number of discs is, the higher the potential failure rate will be, and the larger the amount of heat (one disc will be equipped with two heads). Xiaobian recommends that the hard disk within three discs will be a little better. This is a At equilibrium, there will be a substantial increase in the amount of heat, and the potential for failure rate will increase a lot.

The last small series to say, if you only intend to use the mechanical hard disk as the main force, for a long time no upgrade SSD to do system disk, 7200rpm mechanical hard disk or even mixed hard disk is a good choice, otherwise, honestly buy The 5400rpm hard drive is just fine.