What does 512g solid state drive mean?

512g solid state drive refers to the storage capacity of the solid state drive is 512GB; 512GB generally refers to the form capacity of the hard disk, and the actual capacity is about 500GB. The capacity of the hard disk in the operating system does not match the official nominal capacity. It is both less than the nominal capacity. The larger the capacity, the greater the difference. This is because the hard disk manufacturer’s calculation method of capacity is different from that of the operating system. Caused by different unit conversion relationships.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

512g solid state drive refers to the storage capacity of the solid state drive is 512GB. 512GB generally refers to the formal capacity of the hard disk, and the actual capacity is about 500GB.

Solid State Drive Introduction

Solid State Disk (Solid State Disk or Solid State Drive, referred to as SSD), also known as solid state drive, is a solid state drive. A hard drive made from an array of electronic memory chips. It is a primary flash memory (NAND Flash) computer storage device used as permanent memory.

Solid state drives are composed of control units and storage unit controls (FLASH chips, DRAM chips), and are widely used in industrial control, video surveillance, network monitoring, network terminals, navigation equipment and other fields. Compared with mechanical hard drives, solid-state drives have higher read and write speeds, but the cost is also relatively high. The new generation of solid state drives adopts the new generation of solid state drives SATA-III, PCIex8 or mSATA, M.2, ZIF, IDE, U.2, CF, CFast and other interfaces.

Flash-based SSD is the main category of SSD, and its internal structure is very simple. The main body of a solid-state drive is actually a PCB board. The most basic accessories on the PCB board are a control chip, a cache chip (some low-end hard drives do not have a cache chip), and a flash memory chip for storing data.

Solid-state drives are exactly the same as ordinary hard drives in terms of interface specifications and definitions, functions and usage methods, and their product appearance and size are basically the same as ordinary hard drives (emerging U.2, M.2 and other forms The size and shape of solid-state drives are completely different from SATA mechanical hard drives). It is widely used in military, vehicle, industrial control, video surveillance, network monitoring, network terminals, electric power, medical, aviation, navigation equipment and many other fields.

Advantages:

Fast reading and writing speed: Using flash memory as the storage medium, the reading speed is faster than that of a mechanical hard disk. SSDs do not use magnetic heads and their seek time is almost zero. The continuous writing speed is very amazing. Most solid-state drive manufacturers will claim that their solid-state drives have a continuous reading and writing speed of more than 500MB/s. In recent years, NVMe solid-state drives can reach around 2000MB/s, or even more than 4000MB/s.

The speed of solid-state drives is not only reflected in continuous reading and writing. Fast random reading and writing speed is the ultimate secret of solid-state drives, which is most directly reflected in most daily operations. Related to this is extremely low access time. The seek time of the most common 7200-rpm mechanical hard drive is generally 12-14 milliseconds, while solid-state drives can easily reach 0.1 milliseconds or even lower.

Classification of solid-state drives

Classification method:

The storage media of solid-state drives are divided into two types, one is flash memory (FLASH chip) As a storage medium, another method is to use DRAM as a storage medium. The latest is Intel's XPoint particle technology.

• Flash-based solid-state drives:

  Flash-based solid-state drives (IDEFLASH DISK, Serial ATA Flash Disk): use FLASH chips as storage media, which is usually Talking about SSD. Its appearance can be made into a variety of shapes, such as laptop hard drive, micro hard drive, memory card, USB flash drive, etc. The biggest advantage of this kind of SSD solid state drive is that it can be moved, and the data protection is not controlled by the power supply. It can be adapted to various environments and is suitable for individual users. Longer lifespan varies with different flash media. SLC flash memory generally reaches tens of thousands of PE times, MLC can reach more than 3,000 times, TLC has also reached about 1,000 times, and the latest QLC can also ensure a lifespan of 300 times. The average user's write volume in a year does not exceed 50 times that of the hard disk. Overall size, even the cheapest QLC flash memory can provide a write life of 6 years. Reliability is very high, and high-quality home solid-state drives can easily achieve one-tenth the failure rate of ordinary home mechanical hard drives.

• DRAM-based category:

  DRAM-based solid state drive: uses DRAM as the storage medium and has a narrow application range. It imitates the design of a traditional hard disk, can be volume set up and managed by file system tools of most operating systems, and provides industry-standard PCI and FC interfaces for connecting to hosts or servers. Application methods can be divided into two types: SSD hard disk and SSD hard disk array. It is a high-performance memory that can theoretically be written infinitely. The only drawback is that it requires an independent power supply to protect data security. DRAM solid-state drives are relatively non-mainstream devices.

• Based on 3D XPoint class

  Solid state drive based on 3D XPoint: In principle, it is close to DRAM, but it is non-volatile storage. The read latency is extremely low, easily one hundredth that of existing solid-state drives, and has a near-infinite storage life. The disadvantage is that the density is lower than NAND and the cost is extremely high. It is mostly used in enthusiast-level desktop computers and data centers.

Expand knowledge:

Inside the computer, information is stored, calculated, and stored in binary form. processed and transmitted. Information storage units include bits, bytes and words. The storage capacity units of various storage devices include KB, MB, GB, and TB. It can be based on byte conversion

Unit conversion:

The conversion rate is approximately equal to 1000 (1024), and the order from large to small is T, GB, MB, KB, B. The smaller it is, the bit .

Computer storage units are generally represented by bit, B, KB, MB, GB, TB, PB, EB, ZB, YB, BB, NB, DB... The relationship between them is:

For hard disk capacity, general manufacturers always use decimal counting. Generally, computer operating systems use binary counting, so you will often find that the hard drive capacity you see on your computer is smaller than the actual available capacity on the hard drive. For example, a 20GB hard drive only shows 18.6GB.

Usually the hard drive we buy has a capacity of 1TB, and when plugged into the computer, it displays about 931G. This is normal. What is used in the computer is Binary algorithm. After purchasing a hard drive, careful people will find that the capacity of the hard drive in the operating system does not match the official nominal capacity, and is both less than the nominal capacity. The larger the capacity, the greater the difference.

The nominal 8GB hard drive displays only 7.4GB in the operating system; This is caused by the different calculation methods of hard drive manufacturers and operating systems for calculating capacity, and different unit conversion relationships. . The computer system uses the binary calculation method, while the hard disk manufacturer uses the international unit. In the international unit system, TB, GB, MB, and KB are the counting units of "base 1000". 1000 bytes is 1KB, and every 1000KB is 1MB. Every 1000MB is 1GB and every 1000GB is 1TB.

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