Comparison of advantages between 5400 and 7200 of

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Mechanical hard disk 5400 and 7200 advantages comparison

this article is mainly about the relevant introduction of mechanical hard disk, and focuses on the detailed comparative analysis of the advantages of 5400 and 7200

mechanical hard disk

hard disk can be divided into mechanical hard disk (HDD) and solid state hard disk (SSD). Mechanical hard disk is a traditional ordinary hard disk, which is mainly composed of disk, magnetic head, disk shaft and control motor, magnetic head controller, data converter, interface, cache and other parts

the magnetic head can move along the radius direction of the disc. With the high-speed rotation of the disc thousands of revolutions per minute, the magnetic head can be positioned at the specified position of the disc for data reading and writing operations. The information is written to the disk by the electromagnetic current through the magnetic head close to the magnetic surface, and the information can be read in the opposite way 1 〕 as a precision device, dust is its enemy, so the air entering the hard disk must be filtered

comparison of advantages and disadvantages between mechanical hard disk and solid-state disk

1. Shock resistance and fall resistance: mechanical hard disk is disk type, and data is stored in disk sector. SSD is made of flash memory particles (i.e. memory, MP3, U disk and other storage media), so there are no mechanical parts in SSD, so even if it moves at a high speed and its elongation can be adjusted according to customer requirements, its normal use will not be affected, and the possibility of data loss can be minimized in case of collision and vibration. Compared with mechanical hard disk, hard disk has an absolute advantage

2. Data storage speed: from the evaluation data of pconline evaluation room, the performance of solid-state disk is more than twice that of mechanical disk

3. Power consumption: the power consumption of solid-state disk is also lower than that of mechanical disk

4. Weight: solid state disk drives are lighter in weight. Compared with conventional 1.8-inch hard disk drives, they weigh less than grams

5. Noise: due to the absence of mechanical parts and flash memory chips, the solid and hard parts have the characteristics of low calorific value and fast heat dissipation, and there is no mechanical motor and fan, and the working noise value is 0 dB. Mechanical hard disk is much inferior

6. Price: up to now (November 23, 2014), 128GB solid state drives of ordinary brands are about 450. The price of 1TB mechanical hard disk is only about 360. Compared with mechanical hard disk, solid state disk is more expensive and less cost-effective

7. Capacity: at present, the maximum capacity of solid-state disk is 4T 3.5 inches

8. Service life: SLC has only 100000 times of read-write life, and low-cost MLC has only 10000 times of read-write life. Therefore, compared with solid-state disk, mechanical hard disk has a longer service life

comparison of advantages between 5400 and 7200 mechanical hard disks

the performance of hard disks is mainly reflected in the transmission speed of hard disks. There are two keys that affect the transmission speed of hard disk

1。 Hard disk bandwidth. Refers to the maximum speed of hard disk and external exchange

2。 Internal speed of hard disk. Because the hard disk has mechanical equipment, such as speed, hard disk head addressing will take time

the internal speed of the most garbage hard disk can reach 60mb/s now, and 40mb/s n years ago. Due to power supply, mobility and other reasons, the performance of the mobile hard disk is similar to that of the old hard disk, that is to say, the internal speed of the 7200r mobile hard disk is no matter how 30mb/s. 5400r also has more than 20 mb/s.

that is to say, the mobile hard disk can transmit data outward at a maximum speed of 20MB/s. Unfortunately, the mobile hard disk is transmitted through USB, and the maximum transmission rate of USB is only 3-5mb/s. In other words, no matter 7200 RPM mobile hard disk or 5400 RPM mobile hard disk, the speed of data transmission to the outside will not exceed the maximum speed of USB itself, that is mb/s

so there is basically no difference between them

and when choosing a mobile hard disk, you'd better choose the bottom speed. 5400r is better than 7200r. Mobile devices stress stability

generally speaking, 7200 RPM compared with 5400 rpm, the hard disk must improve the performance of the computer to varying degrees. The faster the hard disk runs, the greater the power consumption will be, and the heat dissipation will be much higher than that of low rpm. With the same configuration of notebook, the temperature of 7200 RPM hard disk is higher than 5400 rpm, and the reading and writing speed is also faster. Compared with 5400 RPM hard disk, 7200 RPM hard disk can better meet the needs of users in terms of transmission rate

for a 7200 (RPM) hard disk, the time required for each rotation is 601000 7200=8.33 milliseconds, so the average rotation delay time is 8.33 2=4.17 milliseconds (on average, it needs to rotate half a turn). According to the same calculation method, the average rotation delay time of a 5400 (RPM) hard disk is 601000 54002=5.56 milliseconds. Compared with the two, 7200 turns is theoretically 15% faster than 5400 turns, but the actual speed is only less than 10% higher than the latter, far from the one-third expected by many people

how to define the rotation speed of hard disk

1. Rotation here refers to the rotation speed, which is the rotation speed of hard disk per minute; Expressed in RPM revolutions per minute

2. General notebook speed: 4200rpm, 5400rpm, sometimes 7200rpm, general desktop speed: 5400rpm, 7200rpm

3. Significance of high speed: hard disks with high speed have the advantage of fast transmission speed, and high-grade hard disks generally have high speed

4. The disadvantages of high speed mainly include large sound, short service life and high heat

mechanical hard disk choosing hard disk is one of the indispensable hardware of computer, which plays a role of storage in computer. At present, when DIY installs hard disks, generally solid-state disks are the first choice for installation, while mechanical hard disks are mostly used as storage disks. In this issue, we mainly talk about mechanical hard disk. In addition to the capacity, the parameters such as speed, cache size, single disk capacity and interface type can not be ignored, which determines the performance of mechanical hard disk

what to pay attention to when purchasing mechanical hard disk

1. Choose the appropriate capacity on demand. The difference from the old hydraulic universal experimental machine is the technology of combining hydraulic loading with microcomputer system.

when purchasing mechanical hard disk mechanical hard disk, the first thing to consider is the size of capacity, which directly determines the size of storage space used by users, so the capacity selection of mechanical hard disk mainly depends on the purpose. Nowadays, 1TB mechanical hard disk has become the mainstream first choice. If the storage capacity is large, you can match your own capacity on demand, such as 2T, 3T, 4T, etc

for mainstream users, among many mechanical hard disk capacities, the most cost-effective mechanical hard disk capacities are 1TB and 2TB, which are also the best choice

2. Rotating speed of mechanical hard disk

the rotating speed of mechanical hard disk is expressed in revolutions per minute. The unit is expressed as RPM. Rpm is the abbreviation of revolutions minute, which is revolutions per minute. The larger the rpm value, the faster the internal transmission rate, the shorter the access time, and the better the overall performance of the mechanical hard disk. The higher the rotational speed of the mechanical hard disk, the shorter the seek time of the mechanical hard disk, the shorter the test experiments of sun attachment fixture, fixed installation, stretching, tearing, bending, cutting, etc., the higher the data transmission rate, and the better the performance of the mechanical hard disk. At present, the mainstream speed of mechanical hard disk on the market is 7200rpm

the rotation speed of the mechanical hard disk refers to the rotation speed of the internal motor spindle, that is, the maximum rotation speed of the mechanical hard disk disc completed in one minute. The speed of rotation is one of the important parameters that determine the speed of the mechanical hard disk. It is one of the key factors that determine the internal transmission rate of the mechanical hard disk, which directly affects the speed of the mechanical hard disk. The faster the speed of the mechanical hard disk is, the faster the reading and writing speed is, but the calorific value also increases

the speed of the mechanical hard disk is different. The performance difference is mainly in the performance of random read/write seek time. The lower the value of random seek performance, the better. It is also the performance that can be directly experienced in the speed of daily mechanical hard disk applications. Whether it is the windows system startup, the reading and writing of a large number of fragmented files, the startup time of various software, etc., are directly related to the random read/write time. This cannot be changed no matter how high the performance of CPU or memory is, so many users begin to choose solid state drives

3. Cache size of mechanical hard disk

in addition to the speed that affects the speed of mechanical hard disk, the cache size of mechanical hard disk is also an important parameter that affects the speed. When mechanical hard disk accesses fragmented data, it needs to constantly exchange data between hard disk and memory. If mechanical hard disk has a large cache, it can temporarily store fragmented data in the cache, reduce the load on the system, and also improve the data transmission speed

at present, the mainstream 1t, 2T and 3T mechanical hard disks in the market generally have a cache capacity of 64MB, but there are still some low-capacity mechanical hard disks with a cache capacity of 32MB, such as 500GB, while some high-capacity mechanical hard disks reach 256MB, such as 4T mechanical hard disks. The larger the cache, the faster the speed


that's all for the introduction of mechanical hard disk. If there are deficiencies, please correct them

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