The English name of SSD is solid state drives, which consists of a control unit and a storage unit (DRAM or FLASH chip). The storage unit is responsible for storing data, and the control unit is responsible for reading and writing data.
Categories of solid state drives
Flash-based SSD(solid state drives):
FLASH chips are used as storage media, which is what we usually call SSD. Its appearance can be made into a variety of styles, such as notebook hard disk, micro hard disk, memory card, super disk, etc. The strongest advantage of this SSD solid state drives is that it can be moved, and the data protection is not controlled by the power supply. It can be used in all kinds of environments, but it has a low service life (relative to a mechanical hard disk) and is suitable for personal users. Because of the FLASH storage medium, it has no internal mechanical structure, so there is no data lookup time, delay time and seek time. As we all know, the mechanical properties of general hard disks severely limit the speed of data reading and writing, while SSD solid state drives are a common character in the operating system, which users can use as storage media completely.
DRAM-based SSD(solid state drives):
Using DRAM as storage media, the current application range is narrow. It mimics the design of traditional hard disks, can be set up and managed by file system tools of most operating systems, and provides industry-standard PCI and FC interfaces for connecting hosts or servers. There are two types of applications, SSD hard disk and SSD solid state drives array. It is a high performance memory and has a long life. The disadvantage is that it needs a separate power supply to protect the data security.
Advantages of solid state drives:
Since solid state hard disks do not have the mechanical structure of ordinary hard disks, the system can complete I/O (input/output) operations on any storage unit in less than 1ms. Moreover, there is no problem of seeking path for mechanical hard disk in solid state hard disk. According to relevant media tests: under the same laptop configuration, when running large image processing software, you can clearly feel that SSD solid state drives is faster when saving or opening files. Its data access time is generally less than 0.2ms, while the common hard disk is generally greater than 15ms. The ability to read data is over 100M/s, the highest is up to 300M/s at present. Writing speed is also above 80M/s, good solid state drives can be above 200M/s. While the speed of reading and writing of 7200 rotary hard disk of SATA interface is the fastest and does not exceed 150M/s, the real test speed is around 70M/s.
Durable and shockproof –
Because all flash chips are used, there are no mechanical parts inside the SSD solid state hard disk, which will not affect normal use even when moving at a high speed or even with a flip and tilt, and will minimize the possibility of data loss in case of accidental drops or collisions with hard objects on the laptop.
No noise –
SSD solid state drives works very quietly without any noise. Thanks to the small heat generation and fast heat dissipation without mechanical parts and flash memory chips, SSD solid state hard disk has a working noise value of 0 dB because it has no mechanical motor and fan.
SSD solid state drives weigh 20-30g less than regular 1.8 Inch hard disks, so don’t underestimate them. On portable products such as laptops and satellite locators, smaller weights are good for portability. In addition, the weight reduction also makes it possible for the notebook to carry multiple SSD solid state drives. Low power consumption. Long duration SSD standby power consumption is only 0.5W, read and write time is less than 2 W, duration is 36 longer than traditional hard disk. Other features. At present, the interface specification and definition, function and usage method of solid state drives are the same as that of ordinary hard disk, and the product shape and size are the same as that of ordinary hard disk. The chip has a wide operating temperature range (-40-85 degrees Celsius).