The data storage capacity of the data center depends on various types of storage devices, and there are three types of storage devices, including three types of hard disks (SSD; HHD; HDD).
Solid State Drive:
A hard disk made of a solid-state electronic storage chip array consists of a control unit and a storage unit (FLASH chip, DRAM chip). The specification and definition of the interface, the function and the usage method of the solid state drive are exactly the same as those of the ordinary hard drive, and the product shape and size are also completely consistent with the ordinary hard drive. It is widely used in military, vehicle, industrial control, video surveillance, network monitoring, network terminal, electric power, medical, aviation, navigation equipment and other fields.
Advantages: fast read and write speed; shock and drop resistance; low power consumption; no noise; wide operating temperature range; light weight
Disadvantages: small capacity; limited life; high price
Traditional hard disk (HDD, short for Hard Disk Drive)
The traditional hard disk (HDD, the abbreviation of Hard Disk Drive) is the English name of the hard disk drive. The most basic computer memory, the computer hard disk C drive and D drive that are often referred to in our computer as disk partitions are all hard disk drives. At present, the common disk capacities of hard disks are 80G, 128G, 160G, 256G, 320G, 500G, 750G, 1TB, 2TB and so on. The hard disk can be divided into 3.5 inches, 2.5 inches, 1.8 inches, etc. according to the size; according to the number of revolutions, it can be divided into 5400rpm/7200rpm/10000rpm, etc.;
Comparison of SSD and HDD
In the past 10 years, the performance of CPU has been improved by more than 150 times, while that of traditional hard disks has been improved by less than 1.5 times. This uneven development has greatly affected the improvement of overall performance, especially in terms of I/O. Moreover, compared with traditional hard disks, SSD (Solid State Drive) does not have a series of parts such as magnetic heads, motors, and disks. It is equipped with NAND Flash chips as storage media, which is unmatched by traditional hard disks in terms of running speed, power consumption, and lightness. .
Hybrid harddrive (HHD):
It is a large-capacity storage device that contains both a traditional hard disk and a flash memory module. Flash handles the most frequently written or restored data in storage. A number of companies are starting to offer variants of the technology, anticipating that it will be sought after in high-end systems, especially laptops and personal digital assistants.
advantage:
Faster data storage and retrieval in applications such as word processors Reduced system startup time Reduced power consumption Reduced heat generation Extended hard drive life Extended battery life for notebooks and PADs Reduced operating noise levels
insufficient:
Longer seek time for data in the hard drive The spin of the hard disk changes more frequently Flash module processing failed, data recovery in it impossible The total hardware cost of the system is higher
At present, traditional hard disks still occupy the main share of the hard disk market due to factors such as low cost. However, with the continuous reduction of the cost of SSD, the continuous improvement of technology and the better support of the system, and the current mainstream notebook computers are also equipped with SATA And the mSATA interface, including the current Ultrabook (Ultrabook), is only possible to achieve "lighter, faster, lower power consumption, and replace the traditional hard disk in the future."
The original text comes from: http://server.51cto.com/News-568445.htm
Address of this article: https://www.linuxprobe.com/storage-device-analysis.html Editor: Atlantis_Yu, Auditor: Pang Zengbao