(SSD; HHD; HDD) Three types of hard disks2225326750
Three types of hard disks (SSD; HHD; HDD)
Solid State Drive（ssd）
The hard disk made of solid-state electronic storage chip array is composed of control unit and storage unit (FLASH chip, DRAM chip). Solid state hard disk is identical with ordinary hard disk in terms of interface specification and definition, function and use method, as well as product appearance and size. It is widely used in military, vehicular, industrial control, video monitoring, network monitoring, network terminal, power, medical, aviation, navigation equipment and other fields.
Advantages: fast reading and writing speed; Shock resistance and fall resistance; Low power consumption; No noise; Large working temperature range; light
Disadvantages: small capacity; Limited service life; High price
HDD/Hybrid hard disk（hybrid harddrive，HHD）
HDD It is a mass storage device that contains both traditional hard disk and flash memory module. Flash memory processes the most frequently written or restored data in storage. Many companies have begun to provide variants of this technology, and they expect it to be popular in high-end systems, especially in laptops and personal digital assistants.
Compared with traditional hard disk, hybrid hard drive (HHD) has many advantages, including:
- Faster data storage and recovery in applications, such as word processors
- Reduced system startup time
- Power consumption reduction
- Reduced heat generation
- Extended hard disk life
- Extended battery life of notebook and PAD
- Reduction of working noise level
The disadvantages of hybrid hard drive (HHD) include:
- Longer seek time of data in hard disk
- Hard disk spin changes more frequently
- The processing of the flash memory module failed. It is impossible to recover the data in it
- The total hardware cost of the system is higher
Traditional hard disk (HDD, short for Hard Disk Drive)
That is, the English name of the hard drive. The most basic computer memory, the hard disk of our computer
Disk C and disk D are hard disk drives. At present, the common disk capacity of hard disk is 80G, 128G, 160G, 256G, 320G, 500G, 750G, 1TB, 2TB, etc. Hard disk can be divided into 3.5-inch, 2.5-inch, 1.8-inch, etc. according to its size; It can be divided into 5400rpm/7200rpm/10000rpm according to the number of revolutions;
Comparison between SSD and HDD：
In the past 10 years, the performance of the CPU has increased by more than 150 times, while that of the traditional hard disk has increased by less than 1.5 times. This uneven development has greatly affected the overall performance improvement, especially in the aspect of I/O. Compared with the traditional hard disk, SSD (solid state hard disk) has no magnetic head, motor, disk and other parts, and carries NAND Flash chip as the storage medium. In terms of operating speed and power consumption, Portable and other aspects are incomparable with traditional hard disks.
At present, the traditional hard disk still occupies the main share of the hard disk market due to the low cost and other factors. However, with the continuous reduction of the cost of SSD, the continuous improvement of technology and the better support of the system and other factors, and the current mainstream notebook computers are also equipped with SATA and mSATA
Interfaces, including the current Ultrabook, can only realize "lighter, faster and lower power consumption" with SSD. It is also the trend to replace traditional hard disks in the future.
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