What is the function of a portable hard drive in addition to loading things?

What is Hard Disk Cache?

Cache memory is a memory chip on the hard disk controller that has extremely fast access speeds, and it acts as a buffer between the internal storage of the hard disk and the external interface.

Since the internal data transfer speed of the hard disk is different from the external interface transfer speed, the cache acts as a buffer. The size and speed of the cache are important factors directly related to the transfer speed of the hard disk, which can greatly improve the overall performance of the hard disk. When the hard disk accesses the fragmented data, it needs to continuously exchange data between the hard disk and the memory, if there is a large cache, the fragmented data can be temporarily stored in the cache, reducing the load on the external system, and also improving the data transmission speed.

What benefits will you get by using a large hard disk cache?

The cache of a hard disk serves three main functions:

One is pre-read. The second is to cache write actions. The third is to temporarily store recently accessed data.

Netizen feelings: My Internet café is diskless, and the effect of using 8m is significantly higher than that of 2m hard disk.

Netizen feelings: My hard disk is 8M, but the non-parallel port is serial. It turns out that it takes several minutes to install IBM 120GXP fashion games, such as a game with more than 2G. Now it feels like it's fast, like it's more than 1 minute.

At present, mainstream hard disks have two specifications of cache of 2M and 8M, such as: Gold Diamond 160G 8M and Gold Diamond 160G 2M; Seagate 200g 8m, etc., so, when buying a hard drive, how to distinguish the cache size? What is caching for?

Seagate 160GB HDD, 2MB vs. 8MB cache** vs. performance parameters.

Mainstream parallel ATA hard disks have different cache sizes due to different rotation speed and positioning. Low-end 5400rpm hard disks mostly use 512k and 2M capacity caches, mainstream 7200rpm hard disk caches are generally 2M and 8M, and serial Serial ATA hard disks are equipped with 8M caches. The impact of caching on hard drive performance is clear.

When the system is running, the read data will be stored in the cache, and the CPU will directly call the data in the cache when processing it, instead of directly accessing the slower hard disk. Therefore, the larger the cache, the more data can be stored, and the speed is naturally faster.

For example, in web services, there are often multiple requests for a web page at the same time, and the size of a web page is tens to hundreds of kilobytes, if the buffer can cache more pages, then the server will perform better. In the case of continuous read and write of large amounts of data, such as audio and ** processing, large-capacity buffer hard disk is the best choice.

Purchasing point of view: because the 8MB cache hard disk is better than 2MB in performance, and at the same price, the difference between the caches is only about 20 30 yuan, so when purchasing, we try to buy 8MB cache hard disks in the case of sufficient supply, and in terms of capacity selection, you can choose according to your needs, but now the large-capacity hard disk has better performance, 160GB cost performance is more value-for-money.

You can install the system, you can store things.

All of the features are built on what it can hold. If there is system software in it, you can make a system, if there is a movie, you can watch a movie, if there is a song, you can listen to a song, if there is a game, you can play a game, if there is a learning software, you can use it to learn, if there is a **, you can use it as a photo album, if there is a document, it is your folder. What you want it to do, you first have to make it something.

The mobile hard disk can only be used to store things like the USB flash drive and the memory of the mobile phone, and cannot be installed with the system. Also, you can put any data in your portable hard drive.

1. The mobile hard disk is equivalent to a mobile memory, which realizes the preservation of data by connecting to the computer, which is convenient for the carrying of all kinds of documents and materials.

2. The mobile hard disk is small in size and large in capacity, you can input all the things you want, and it can be displayed when you connect to the computer and open it, which is equivalent to bringing a small computer, because of its small size, large capacity, lightweight, and easy to carry, so it is becoming more and more popular.