What is an SSD? What is the difference between it and a regular hard drive

A solid state disk or solid state drive, also known as an electronic hard disk or solid state disk, is a hard disk composed of a control unit and a solid-state storage unit (DRAM or Flash chip). The interface specifications and definitions, functions and usage methods of SSDs are the same as those of HDDs, and the product shape and size are also the same as those of HDDs. Because SSDs don't have the rotating media of HDDs, they are extremely shock-resistant.

Its chips have a wide operating temperature range (-40 to 85 degrees Celsius). At present, it is widely used in military, vehicle-mounted, industrial control, first-class monitoring, network monitoring, network terminals, electric power, medical, aviation, navigation equipment and other fields. At present, due to the high cost, it is gradually becoming popular in the DIY market.

The solid-state drive is composed of a control unit and a storage unit, which is simply a hard disk made of an array of solid-state electronic memory chips. Compared with ordinary hard disks, it has the advantages of low power consumption, shock resistance, high stability and low temperature resistance The shape of the solid state drive only has a product label on the front, and only the screw holes can be seen on the back side except for the interface, and there is no printed circuit plate of the ordinary hard disk. The interface is also basically similar to taking SATA.

Ordinary hard disks are butterfly magnetic type, while solid state drives use flash memory particles (i.e., storage media such as ***, memory, and USB flash drives).

The reason why the solid-state drive is called a solid-state drive is because the storage unit inside has been replaced by a disc that requires mechanical movement to the flash memory that is now used on MP4, and it can almost be considered that there is no possibility of physical damage So it is safer And the biggest advantage is: fast speed, power consumption is almost negligible, it is one of the branches of the development of hard disk in the future But for the time being, the cost is still a bit high, and the capacity is not easy to grow.

SSDs are actually composed of flash memory chips + chips! The good thing about an SSD is that it's slower to write (still faster than a hard drive) and it's pretty fast to read!

The information age is the era in which information generates value, and its representative symbol is"Computers"It is mainly based on information technology, focusing on the creation and development of knowledge, and behind the computer, there is an organic combination of a series of precision instruments and wisdom, of which the hard disk is the most important storage device of the computer.

Hello friend. The most important characteristics of a hard disk are the speed and the capacity.

Now there is a half-solid half-disk, the system is installed on the solid-state drive, it is just under development, and now the CPU, graphics card, memory, etc. have been improved, and the hard disk has become the bottleneck of the computer.

The solid-state is fast, the storage medium and principle of the solid-state drive are similar to the high-speed flash memory card, not an ordinary hard disk and a disk, but also a seeker, so fast. Two days ago, I saw that there were 32g in the Pacific Ocean, which seemed to be more than 2,000, which was too expensive.

Composition: Solid-state hard disk is a hard disk made of solid-state electronic memory chip array, mechanical hard disk is mainly composed of: platter, head, platter shaft and control motor, head controller, data converter, interface, cache and other parts of the hard disk.

Speed: SSDs have much more read and write speeds than HDD blocks. For example, it takes 200 milliseconds for a mechanical hard disk to rotate at 15,000 revolutions per minute, while on the SSD, because the data is stored in semiconductor memory, it can complete the IO (input and output) operation on the storage cell at any location in less than one millisecond, so the SSD can reach 50 800 times that of the hard disk on the IOPS (i.e., how many IO movements per second), which is the most critical performance indicator for many applications.

Shock and drop resistance: HDDs are all disk-type, and data is stored in the disk sector. The SSD is made of flash memory particles (i.e., memory, ***, USB flash drive and other storage media), so there are no mechanical parts inside the SSD SSD, so that even in the case of high-speed movement or even with flipping and tilting, it will not affect the normal use, and the possibility of data loss can be minimized in the event of collision and **.

Compared with mechanical hard disks, the solid hardware has an absolute advantage. Although SSD drives have great advantages in terms of speed and security, they are much higher than traditional hard disks in terms of **. Generally, the SSD is installed in the first SATA interface, used as the main partition, and the operating system and some software are installed to ensure the running speed and boot speed of the computer, and the HDD is only used to store data and documents.

A hard disk is the primary storage device of a computer. At present, most of the common laptops on the market are SSDs installed by default, so what is the difference between SSDs and HDDs? Let's take a look!

The difference between an SSD and a HDD.

1. Different performance: The SSD is an ordinary drive letter in the operating system, and users can use it completely as a storage medium. However, the mechanical characteristics of ordinary hard disks severely limit the speed of data reading and writing, and the biggest bottleneck in the speed of computer operation is precisely on the hard disk.

2. The principle of reading and writing is different: the solid state disk is the main control to read and write Nandflash, and the ordinary hard disk is the disk that the head reads and rotates. SSDs are bitwise reads and writes, while HDDs can be understood as sequential reads and writes.

3. Different service life: SLC only has a read and write life of 100,000 times, while the low-cost MLC has a read and write life of only 10,000 times. Although there is no limit on the number of writes in ordinary hard disks, the basic service life is about three to five years.

4. Data recovery is different: after the data on the SSD is deleted, it cannot be recovered with the help of software such as data recovery; Traditional HDDs can be retrieved by some professional data recovery software, which is also a disadvantage of SSDs.

5. Different economy: Solid state drives are generally 2-3 times larger than traditional hard disks. However, with the continuous development of Moore's Law, the density of SSD NAND flash memory chips will become larger and larger, the storage capacity will be higher and higher, and the future ** will be lower and lower, and it is foreseeable that it is imperative for SSDs to replace traditional hard disks.

The most significant features of SSDs should be low power consumption, no noise, vibration resistance, and low heat; Returning to the chain of judgment.

The main characteristics of mechanical hard disk are large capacity, stable performance, no copycats, and low price.

The SSD is actually a large flash memory leakage, with high security (no motor, the possibility of physical damage is reduced), fast speed (generally able to reach the limit of SATA interface and very stable), the capacity value is the same as that of ordinary hard disks, it is a little smaller, and it is often used as a system disk.

However, there are fewer applications now, mainly on the superbook, on the superbook,