What does 3 in HDD 7200 3 mean?

You're talking about Seagate's hard drives. 7200 3 is a notebook hard drive, 3 is a series, from 1 to 2 to 3, basically a new generation a year. In terms of desktops, it is already 12, and the Seagate desktop hard drives released in 2009 are all 7200 12 series.

It seems to be algebra, several generations or something. Mine is 12 generations. That's how you guessed.

The analysis is as follows: Generally speaking, 7200 rpm than 5400 rpm hard disk must improve the performance of the computer to varying degrees, the faster the hard disk is running, the greater the power consumption, and the heat dissipation will be much higher than that of the lower speed.

With the same configuration of the notebook, the temperature of the 7200 rpm hard disk is higher than that of the 5400 rpm, and the read and write speed is also relatively fast. Compared with 5400 rpm hard drives, 7200 rpm hard drives can better meet the needs of users in terms of transfer rate.

A 7200** per minute) drive takes 60 1000 7200 milliseconds per rotation and has an average rotation delay of milliseconds (on average, half a revolution).

According to the same calculation, the average spin delay of a hard disk of 5400** per minute is 60 1000 5400 2 ms. Compared with the two, 7200 rpm is theoretically 15% faster than 5400 rpm, but the actual speed is only less than 10% faster than the latter, which is far from the one-third that many people expect.

Both of these values represent the rotation speed of the motor spindle in the hard disk, which is the maximum number of revolutions that the hard disk platter can complete in one minute. That is, the speed of the 7200 rpm hard disk is 7200, and the same is 5400 rpm for 5400 rpm. At present, the speed of mainstream desktop hard disks is 7200 rpm, most of the mainstream notebooks are 5400 rpm, taking into account power consumption, heat dissipation, noise, etc., and mid-to-high-end notebooks have also reached 7200 rpm.

In large computers such as servers, SCSI hard disks can reach 10,000 revolutions or even 15,000 revolutions, and the performance is far from comparable to that of home desktops. Hope it helps!

Refers to the speed of the hard disk, the higher the speed, the faster the hard disk read speed. 7200 rpm.

It is the speed of the hard disk, relatively speaking, the higher the speed of the hard disk, the better the performance.

Hard disks generally have 4400rpm, 5400rpm and 7200rpm, the higher the number, the faster the speed.

7200 means which speed of the draft, the disk rotates 7200 revolutions per minute, it belongs to the key scatter high-speed hard disk, the read speed is fast, DDR3 is the 3rd generation memory, theoretically it is 3 times the running rate of the 1st generation memory, but in fact, it is only a little different from the 2nd generation memory in terms of read speed, and the others are better than the 2nd generation, so it is stronger than the 3rd generation, and now it is the 3rd generation of slow waiting, the 2nd generation is outdated, and the 5th generation is only used by Samsung.

7200 is the rotational speed of the hard disk, and DDR3 is the type of memory.

WD is WestDigital, Western Digital, the manufacturer of hard drives; 500GB is the capacity, no doubt; 7200 rpm is the speed, which determines the data transmission rate to a certain extent; 16M is a first-level cache, and the Western Digital blue disk is generally 16 megabytes; Blue disk: Ordinary hard disk, suitable for home use. The advantage is that the performance is stronger, the first is lower, and the cost performance is high; The downside is that the sound is slightly louder than the green disk and the performance is slightly worse than the black disk.

This means: WD Western Digital, 500GB is the capacity. 7200 rpm, currently mainstream. 16M hard disk cache. The higher, the better, which is mainstream. SATA3 is currently the mainstream serial port hard disk.

The 64MB here refers to the cache of the HDD.

Literally, the larger the cache, the better, in fact, the size of the cache and the speed of the hard disk has a direct relationship, the maximum write speed of the mechanical hard disk is currently kept within 220MB s, the sustained read and write speed is within 170MB seconds, and the hard disk uses 64MB DDR2 cache to transfer data to the north bridge chip and memory. If the hard disk uses a larger cache, the performance will not only not improve, but will reduce the hit rate of the hard disk to extract data.

Due to the large cache, the hit rate of the hard disk to extract data has been reduced, and the read speed of the hard disk is prone to ups and downs, which is also the reason for the "speed gate".

64M refers to the cache size of the hard disk controller, in principle, the larger the cache, the better. In fact, the capacity of the cache is related to the speed, not the bigger the better, and the use of the hard disk, such as desktop, enterprise-level hard disk and other application scenarios, the higher the speed and the larger the cache, the higher the performance and reliability, so the enterprise-level enterprise-class hard disk is higher than the desktop hard disk**.

64M refers to the cache of the hard disk.

Look at the market! 64 128 is not cheap.

It is boxed and has a three-year warranty. It is more expensive than three times a year, but the quality assurance is better.

The box description is boxed, 3 years description, the warranty period is 3 years, and it will be repaired free of charge within 3 years