Hard disk interface technology: Hard disk interface technology and transmission rate are different names with the same meaning. At present, the commonly used interface technologies in the market are ATA 100 and ATA 133. In theory, the data transmission of ATA 100 hard disk can reach 100MB/ s, but in practice, no matter which brand of hard disk, it is impossible to achieve this effect. The external data transmission rate in ATA 133 technology has reached 133MB/S, and the appearance of S-ATA will be further improved.
Hard disk speed: Because the hard disk is the slowest link in the whole PC storage system, our memory and CPU are always waiting for the hard disk to run. Undoubtedly, if the speed of the hard disk is increased, the system performance will be greatly improved. The biggest factor that determines the speed of hard disk is the speed, so at present, 7200 rpm and 5400 rpm are also used to distinguish the high-end and low-end markets of hard disk.
Single disk storage capacity of hard disk: The so-called single disk storage capacity refers to the capacity of a hard disk, because a hard disk usually has several disks, and the single disk storage capacity plays a vital role in the size of the hard disk, second only to the rotation speed! And the storage capacity of each disk directly determines the continuous data transmission speed of the hard disk. At the same speed of hard disks, each hard disk with larger storage capacity can read more files in the same time than each hard disk with smaller storage capacity, so the transmission speed of hard disks will also be accelerated.
Cache capacity: Cache is also called cache (in KB or MB). Cache is the place where the hard disk exchanges data with the external bus. After the magnetic signal is converted into an electrical signal, the hard disk is sent out step by step according to the PCI bus cycle through repeated filling and emptying of the cache, and then filling and emptying. Therefore, the role of cache can not be underestimated, and the capacity and speed of cache directly affect the transmission speed of hard disk.
New hard disk products emerge one after another.
At present, the domestic hard disk product market can be said to be in the transition period from old to new, and new hard disk products emerge one after another. We briefly counted the new hard disks that users can choose now: Hitachi Longteng V, Maituo Golden Diamond VIII, Golden Diamond IX, Seagate New Cool Fish V and Western Digital WD2000BB/JB, etc. In addition, Seagate Cool Fish 7200.7 and 5400 have been officially released but not yet listed.
Among these new hard disks, Longteng 5th Generation, Diamond 8th Generation, Cool Fish V and WD2000BB/JB all have 60GB of storage, and only Diamond 9th Generation has 80GB of storage. Their interface types are still parallel ATA, namely ATA/ 100 or ATA/ 133. Of course, it is not excluded that manufacturers will launch products with the same name that support serial ATA interface types. For example, both the Golden Diamond Nine Generation and the Cool Fish V Generation have serial ATA interface versions, while the Western Digital indicates that WD2000BB/JB will also launch a version that supports serial ATA interface types. As for whether Hitachi Longteng V will also launch serial ATA interface, the newly established Hitachi Global Storage Technology Company has not made it clear.
In addition, the storage capacity of Seagate Cool Fish 7200.7 and 5400. 1 mentioned earlier is 80GB, which supports serial ATA. Cool Fish 7200.7 Plus combines 8MB data cache, while the normal version of Cool Fish 7200.7 still maintains 2MB data cache. Seagate said that Cool Fish 7200.7 is a technical improvement based on the previous generation product barracuda ATA V, so it will be used to replace Cool Fish ATA V hard disk in the future.
Around these important indicators of hard disk and the latest hard disk products, can you predict the future trend of hard disk? Yes, that is, the future will belong to serial ATA. Hard disks will continue to develop in the direction of higher capacity, faster speed and more stability, which is why more and more hard disks with the largest capacity level are equipped with 8MB data cache.
Fake goods problem:
In recent years, the problem of counterfeit goods has intensified, spreading to almost all computer accessories products. Fortunately, hard disk products only have the problem of purchasing channels, and there is no problem of counterfeit goods. As long as consumers recognize the logo on the hard disk and learn to identify it, under normal circumstances, they will not be cheated by profiteers in the purchase. In addition to fakes, many manufacturers sell some old hard disks to you as new ones. At this time, you must pay attention to let the merchants write the trademark and model of the hard disk clearly. If he gives you the previous generation or older products, you can have a good basis when you come back to replace them.
The difference between parallel imports and genuine hard disks
Although the DIY market is becoming more and more standardized, parallel imports are still popular, and parallel hard disks can still be seen everywhere. So what is the main difference between parallel imports and genuine hard disks? The difference is mainly reflected in two aspects: quality and service. At present, the sources of parallel hard disks on the market are complex and scattered to users. It may not be that there is no damage after frequent loading and unloading, and problems will occur in production. Although you can find a dealer to replace it, who wants to buy a defective new one? On the other hand, some dealers can't guarantee the quality when selling parallel imports.
The most intuitive difference between licensed hard disks and parallel hard disks is whether there is a packaging box. Of course, just a box is a piece of cake for JS, and it is nothing new for parallel hard disks and licensed boxes to deceive consumers. This method can be confirmed by the warranty label of the domestic agent and the anti-counterfeiting mark on the top of the hard disk.
You can judge whether it is genuine or not by comparing the hard disk number on the disk body and the agent's warranty.
Generally, parallel hard disks do not have formal packaging boxes. Even if there is a box, there is no warranty label on it. As long as we keep this in mind, we can easily distinguish between parallel imports and licensed hard disks.
Research on the authentication method of Seagate hard disk.
Seagate's authorized hard disk products in China all have Seagate's laser labels, and Seagate's agents in China include Laser Computer, Guangyuan Store, Visa and Bixin. Among them, Seagate hard disk represented by laser computer has a rectangular black label in addition to Seagate's own golden laser label. However, the hard disks of laser computers, Guangyuan Bank, Visa and Bixin Agency all have Seagate's own golden laser labels. So when buying Seagate hard drives, you must first confirm whether you have Seagate's own golden laser label.
This is the licensed product of VST, with the toll-free number of ST on it.
Repair and appraisal of second-hand hard disk
Some hard disks with physical defects can be reused after being repaired by manufacturers, but their stability has been greatly reduced and their life will not be long, so this kind of hard disk is the most dangerous. Generally speaking, as long as the serial number on the surface of the hard disk can correspond to the product packaging box one by one and the packaging box is unopened, then we can basically determine that it is not a repaired product.
Teach you a practical method to identify and repair hard disk.
Because the technical content of hard disk is relatively high, there are only a few places in the world where it can be produced. Therefore, during the warranty period, the hard disks are returned to the original factory for repair, and the manufacturers will mark the disks accordingly after repairing the hard disks, which has become an important symbol of our uniqueness. But because it is written in English, you may ignore the past if you are not careful. WD hard disk is shown in the figure, and there is an "R" letter after the date in the circle shown in the figure, which proves that the maintenance date is indicated in the circle, not the production date; In addition, in the label box, if you look carefully, you can see the word "renovation" in light blue, and there is a conspicuous "renovation" in the upper right corner. If you see such a sign on your hard disk, don't buy it. In addition, if the price of hard disk is much cheaper than other places, it may be to repair the hard disk, or "don't be greedy if it is cheap."
As for the second-hand hard disk, its confirmation method is simpler. The used hard disk always has some scratches at the IDE interface. In addition, if the hard disk you bought has been partitioned, it can definitely be a second-hand hard disk, because the manufacturer will not partition it for you.
Numbering rules for each hard disk:
At present, the hard disk brands on the market are familiar to everyone, and the larger manufacturers are nothing more than IBM, Maituo, Seagate and Western Digital. However, with the continuous innovation of hard disk products, it is difficult for most users to interpret the serial numbers of hard disk models of various brands. In fact, each manufacturer's hard disk number has its own inherent law, and each serial number also represents the specific meaning of the hard disk itself. Through these complex numbers, users can more accurately understand the performance indicators of hard disk, including interface type, speed, capacity, cache and so on. We mainly focus on mainstream ATA interface products, and introduce the latest numbering rules of hard disks of various manufacturers for your reference.
1, Seagate (Seagate)
IDE series produced after 1 99965438+1October1:
Saint X-XXXXXX-X-XX
ST stands for Seagate products.
The second part shows the shape of the hard disk. 3 stands for 3.5 inches, low profile, 1 inch high.
The numbers in the third part represent the capacity in MB.
The fourth part indicates the interface type. A-ultra ATA, as-serial ATA
As shown in the figure, ST3 120023AS represents Seagate's 3.5-inch, with a capacity of 120023MB( 120GB). AS at the end shows that this is the latest Cool Fish 5, with serial ATA interface and 8MB cache.
2、IBM
IBM's new numbering rules are as follows (applicable to SCSI hard disks after Ultrastar 73LZX and IDE hard disks after Deskstar 60GXP):
IC FF H CAP IF xx SP-X
IC: IBM Company
FF: Overall dimension, 35 means 3.5 inches (88.9 mm) and 25 means 2.5 inches (63.5 mm).
H: Height, L stands for 1 inch (25.4 mm), T stands for 0.49 inch (12.5 mm), and N stands for 0.37 inch (9.5 mm).
CAP: capacity, in GB.
IF: interface type, AV——ATA interface, UW-Ultra160CSI 68-Pinwide, UC-ultra 160 CSI 80-pin SCA, XW-Ultra320SCSI 68-Pinwide, XC-Ultra320SCSI 80-PinSCA, F2-
XX: specific code, which indicates the product series model, ER indicates Deskstar 60GXP series, VA indicates Deskstar 120GXP series, and V2 indicates Deskstar 180GXP series.
SP: rotational speed in RPM//min. 04——4200,05——5400,07——7200, 10—— 10000, 15—— 15000。
X: indicates the cache capacity, enabled from Deskstar 180GXP, with 0-2mb cache and 1-8mb cache. Among them, the cache of 60GB products with one disk is 2MB, the caches of 80GB and 120GB products with two disks are 2MB and 8MB, and the cache of 180GB products with three disks is 8MB. Pay attention to the distinction when purchasing.
As shown in the figure, IC 35L060AVV207-0 is a 3.5-inch deskstar180Xp hard disk with Ultra ATA 100 interface produced by IBM, with a capacity of 60GB and a rotation speed of 7200/min. The last "0" indicates that the hard disk has only 2MB cache.
3. Maituo (Maituo)
XX-XXX-X-X
The first part points out the product family model. 2R2R-Fireball 53 1DX American Diamond Generation, 22B-Fireball 54 1DX American Diamond Generation II, 2F-Fireball 3,4W4w-Diamond Max 536DX Star Diamond Generation II, 4D, 4K, 4G——Diamondmax 540X Star Diamond Generation III, 4r—Diamond Max16 four generations of star diamonds, 5t—Diamond Max Plus 60 six generations of gold diamonds, 6L——Diamondmax Plus D740X seven generations.
The second part represents the capacity in GB.
The third part explains the buffer capacity, interface and spindle motor type. H-H-UltraATA100 interface, 2MB cache, J-J-UltraATA133 interface, 2MB cache, ball motor. L-ultra ATA 133 interface, 2MB cache and use fluid dynamic bearing motor, p-ultra ATA 133 interface, 8MB cache and use fluid bearing motor, m-serial ATA/ 150 interface (serial ATA/ 150).
The fourth part shows the number of magnetic heads used, that is, the number of recording surfaces, from which the storage capacity of each disk can also be calculated.
As shown in the figure, 6L020L 1 shows that this is the seventh-generation hard disk of Maituo Company, with a capacity of 20GB, Ultra ATA 133, a liquid bearing motor, and the head count (recording surface) is 1.
4. Western Digital (WD)
As shown in the figure below, the number of Western Digital hard disk usually consists of the chief editor number and the additional number, but Western Digital did not disclose the specific meaning of the additional number to the retail market.
Part number: WD-XXXX-X-X.
The first part WD represents the products of Western Digital.
The second part represents the capacity in GB.
The English letters in the third part indicate speed and buffer capacity. A-5400, B-7200, J-7200 and 8MB cache.
The fourth part indicates the interface type. A-super ATA66, b-super ATA 100. Additional numbering part: XX-XX-XX
The first part is OEM customer identification, 00 is retail market, and the rest is OEM customer code.
The second part is the version code of the same series, corresponding to each disk storage, CP——Protégé series (commonly known as EB series) 40GB each disk storage version, CB——Caviar5400 series (namely AB series) 40GB each disk storage version, CA——Caviar7200 series (namely BB series) 40GB each disk storage version, Cr-Caviar SE7200 series.
The third part is the firmware version.
As shown in the figure, the chief editor's number WD 1800JB indicates the products with Ultra ATA 100 interface, with hard disk capacity 180GB and rotation speed of 7200 rpm. The 00 in the first part of the attachment number indicates that the hard disk is a retail product, and the version code part of Western Digital has not provided detailed information for inquiry for the time being. The firmware version is A0.
5. Samsung (Samsung)
X-X-XXX-X-X
The first part stands for product series, and S stands for SpinPoint series.
The second part represents the product series, V-5400 rpm V series and P-7200 rpm P series.
The third part represents the production capacity, and the models before P40 and V40 (including these two models). This number multiplied by 100MB is the total capacity. Starting from V60, these three numbers are directly used to represent the capacity in GB.
The fourth part shows the number of magnetic heads, that is, the number of recording surfaces, from which the storage capacity of each disk can be calculated.
The fifth part is the interface type, H-H-super ATA 100, D- super ATA 66.
As shown in the figure, SV 1204H represents Samsung SpinPoint family V60 series 5400 rpm product with capacity of 120GB and four magnetic heads (recording surface). On this basis, the storage capacity of each disk is 60GB, and the interface of Ultra ATA 100 is adopted.
Through the understanding of the hard disk number, I believe that everyone will be able to correctly identify the disk they need in the purchase, so as to be targeted. It should be noted that the serial numbers of many hard disks are polished, so I hope to pay more attention when buying.
after service
Finally, talk about after-sales service. The warranty problem of hard disk is more prominent because of frequent reading and writing operations. I believe all DIY people are well aware of the hard disk warranty storm that has been raging some time ago. Now, under normal circumstances, the warranty service provided by most hard disks is only one year, but the warranty of Maituo is two years; Samsung has a three-year warranty, and most high-end hard drives also have a three-year warranty. We have said a lot about hard disk warranty before, so I won't go into details here. Of course, the above refers to the failure of the hard disk itself. Man-made damage, not responsible for warranty. So when buying a hard disk, you must go to some formal channels to buy it, so that you can protect your rights and interests when something goes wrong. In terms of after-sales service, brands such as Maituo and Samsung have a good reputation.