1, memory particles, the flash memory chips of solid-state hard disks on the market are mostly MLC and TLC, which are cost-effective and can meet the needs of most consumers for daily data copying. At present, QLC has appeared, and its performance is not as good as TLC；; SLC generally appears in high-end solid state drives and is suitable for enterprise users. Particles also affect reading and writing speed;
2. Selection of capacity; Generally, you need to choose according to your own needs-it has been able to meet the storage acceleration function of home computer system disk and some professional software or games. If you are a gamer, you can buy a larger SSD to speed up the game reading time;
3. Interface types, generally SATA3.0, M.2 and PCI-E. Transmission protocols include AHCI protocol and NVMe protocol. The reading and writing speed of NVMe protocol SSD is much higher than that of AHCI protocol. General PCI-E and some M.2 use NVMe protocol;
4. In terms of reading and writing speed, the most important thing is random reading and writing speed. The unit is IOPS, that is, the number of IO operations per second, which can be considered as a throughput indicator. Its characteristics are contrary to continuous reading and writing. Indicates the speed of SSD reading and writing fragmented files and program startup, and reflects SSD's ability to read and write small files.
How to choose a solid state drive:
Hard disk is one of the important parts of computer, and its quality is directly related to the stability of the machine, so how to choose hard disk? First of all, you need to know which brands of hard disks are currently on the market. At present, the mainstream hard disks on the market generally include IBM, Seagate, Western Digital and Maituo. When purchasing hard disks, we should consider the following aspects:
1, hard disk interface technology: Hard disk interface technology and transmission rate are called differently, but the meaning is the same. The transmission rate is divided into external data transmission rate and internal data transmission rate. The general external data transmission rate, also known as burst data transmission or interface transmission rate, refers to the speed at which data is output from the cache of the hard disk. Ata and ATA are commonly used interfaces in the market, and the data transmission of ATA hard disk can theoretically reach/second. But in actual use, no matter which brand of hard disk is used, this effect can not be achieved. However, ATA interface can effectively reduce CPU's control over data transmission, transfer data directly from hard disk to memory, reduce CPU resource occupation and improve the overall performance of many computers.
The external data transmission rate of this technology has reached /S, and the appearance of the new S-ATA will be further improved. However, the influence of external transmission rate on hard disk is not the most important. Internal transfer rate, also known as maximum or minimum continuous transfer rate, refers to the reading speed of hard disk to disk. This is very different from the external data transmission rate. Generally between /s and /s, the internal transmission rate is generally the most important criterion to evaluate the performance of hard disk, which is directly proportional to the capacity of single disk and the speed of hard disk. Advanced or not will also affect its internal transmission speed. So you should pay attention to the internal data transmission rate when you buy. In this regard, Maituo Hard Disk is the first to introduce ATA hard disk-Golden Diamond Generation 7, which has faster transmission speed and more stable performance. Golden Diamond Generation 7 has a high single disk capacity, and the transmission rate of high-end transmission hard disk can reach /s, and many advanced technologies are adopted. Whether this hard disk is good or not depends on whether the motherboard supports it or not. At present, there are not many motherboards that support ATA-. Therefore, more consideration should be given to this aspect. Of course, there are firewire interface and USB interface hard disks on the hard disk interface. Especially the hard disk performance of the interface is outstanding. It can not only support hot plug like USB, but also has a transmission rate unmatched by any hard disk, which is very fast. Being able to transmit a large amount of data and information quickly is a great enjoyment for users, but the high price makes many consumers flinch. If you have enough money, you can think about it. As for S-ATA as the future standard, I believe it can be applied in a year or two!
2. Hard disk speed: The speed of hard disk is also called "spindle speed", which can directly affect the speed of hard disk. At present, the speed types of IDE hard disks on the market are, and the most mainstream hard disk speed is (revolutions per minute). It has also improved. At present, hard disk has become the mainstream, which is certain, but hard disk still has the advantage of high cost performance. But ordinary consumers still have to choose according to the actual situation. There is no need to choose a high-speed hard disk, because when the speed of the hard disk increases, it will also bring temperature rise, spindle wear and working noise. In terms of price, the hard disk with the same storage space is 50 to about 80 yuan more expensive than the hard disk. In terms of practicality, ordinary users have not benefited much. Professional users can choose high-speed hard disk. Because in some ways, speed is higher than speed. Theoretically, the performance of hard disk is 38% higher!
3. Single disk capacity of hard disk: The so-called single disk capacity refers to the capacity of a hard disk, because a hard disk usually contains several disks, and single disk capacity is very important for hard disks. The size of the hard disk. Second only to speed! The capacity of a single disk directly determines the continuous data transmission speed of the hard disk. The performance of single-disk rotating U6 hard disk is better than some previous hard disks, because the capacity of single disk is huge. With the development of many hard disk technologies, the single disk capacity of hard disks is increasing. At present, the maximum single disk capacity of hard disk has been reached. Because the height of the hard disk is standardized and will not change, the number of hard disks generally does not exceed four, that is, eight faces, so the capacity of the hard disk can only be changed by the number of disks and the capacity of a single disk. At present, we can calculate that the maximum capacity of IDE interface hard disk will not exceed *4 slice =. Of course, ordinary consumers do not need to consider these aspects when buying. But professional users need to consider that the performance of a single large-capacity hard disk is the same as that of a small hard disk with the same speed. More files can be read in a given time, so the transmission speed of the hard disk will be faster.
4. Hard disk cache: Hard disk cache is also called cache. Cache is the place where the hard disk exchanges data with the external bus. The reading process of hard disk is to fill, empty and refill the cache again and again after the magnetic signal is converted into electrical signal. , and then empty it and send it out step by step according to the PCI bus cycle, so the role of cache can not be underestimated. The capacity and speed of cache can directly affect the transmission speed of hard disk. Cache is static memory, which is different from the memory we know (dynamic memory) and does not need to be refreshed regularly. Its capacity is 2KB and 8KB. Cache is some high-speed DRAM, which is divided into EDOSDRAM, direct write and write back. Nowadays, most hard disks use write-back cache, which can read and write data, and can improve performance more than direct write cache. Theoretically, the faster the cache, the better. In the large-capacity hard disk launched by Western Digital, the comprehensive performance is far ahead of other competitors due to the use of 8M large-capacity cache.
5, overclocking problem: Many friends like to use overclocking when they go home after buying a computer. I have never been in favor of overclocking myself (but it's just my personal opinion, keep it! In fact, overclocking depends not only on the overclocking ability of CPU and the performance of motherboard, but also on many other devices that can judge whether overclocking is successful or not. The key is that the hard disk is also one of the devices. When the FSB of CPU increases, the data transfer rate of hard disk will also increase. If the hard disk can't bear it, there will be an abnormal situation, which will lead to overclocking failure, even serious data loss or system crash. Look out, friends!
6. Hard disk noise problem: Hard disk noise is a very annoying thing. I played a lot of games at night, because the noise was too loud, and my father forced me to turn off the hard disk (pity! )。 Indeed, annoying noise will make us feel uncomfortable. In fact, there is a way to avoid it, because ordinary IDE interface hard disks are all aluminum substrates, because the surface is uneven. So there will be noise when running at high speed. If you use a hard disk with glass substrate, it will be quieter. Moreover, the glass disk runs smoothly, dissipates heat quickly and has high shock resistance. In this regard, the "blue giant" IBM's glass hard disk stands out. At present, IBM's hard disks are all glass disks.
7.AverageSeekTime, AverageAccessTime and AverageLatenyTime: average seek time refers to the time required for the head to move to the track where the data is located, which is generally between 5ms~, and the performance is relatively high. Ok, generally around 8 ms, the average delay refers to the time it takes for the corresponding data to reach the sector of the head, which is generally 1 ms ~ 6 ms, and the smaller the data, the better.
8. Additional technologies: mainly refer to data protection technology and shockproof technology of hard disk. At present, hard disk is still the main place for users to store data. Therefore, in order to ensure the integrity and reliability of user data, each hard disk is based on its own hard disk product. Data protection technology and earthquake prevention technology. For example, the data protection technology introduced by Quantum is DPS(DataProtectionSystem), its subsequent technology is DPSII, and its shockproof technology is SPS (Shock Protection System). Maituo's data protection technology is MaxSafe, and its shockblock technology is shockblock. The data protection technology of western data is SafeGuide. ); Seagate's data protection technologies include SeaShield.