Do you Know What it is SSD?

SSD (Solid State Drive) is a hard disk which is made by NBND FLBSH. It is composed by the control unit and storage unit (FLASH chip or DRAM chips). SSD is exactly the same with the common hard disk on interface's specification, definition, function and usage. And the shape and size are fully consistent with the ordinary hard disk.

Types of SSD


The SSD has two types of storage medium: one is FLASH memory (or FLASH chip), and the other is DRAM.

Flash -based SSD

SSD 1

The commonly used SSD adopts FLASH chip as a storage medium. Its appearance can be made into various shapes (such as the notebook hard disk, hard disk, memory card, U disk, etc). The biggest advantage is the ability to move, and data protection is not affected by power. It can adapt to various environments, and is suitable for individual users.

DRAM-based SSD

SSD 2

This kind of SSD adopts the DRAM as a storage medium and has a relatively narrow application range. It follows the design of the traditional hard drives and can be managed by most of the operating system's file system tools. It also provides the industry standard PCI and FC interface to connect the host or server. Application methods can be divided into two categories: SSD hard disk and SSD hard disk array. It is the memory with high-performance and long service life. The only disadvantage is that it needs independent power to protect data security.

Basic Structures


SSD 3

Flash memory-based SSD is the major type of SSD. It has no moving mechanical components. This distinguishes them from traditional electromechanical magnetic hard disks (HDD) which contain spinning disks and movable read/write heads. Compared with electromechanical disks, SSDs are typically more resistant to physical shock, run silently, have lower access time, and less latency. Its internal structure is very simple. Actually, the main body of the solid state drives is a PCB board. And the most basic parts of the PCB board are control chip, cache chip (or buffer) and flash chip.

Main Control Chip
It has two functions:
1. Allocating data load in the flash memory chip;
2. Responsible for the data transmission (it is used to connect flash chips and external SATA interface). Different main control chips have various abilities. The performance will be different in the process of dealing with data and reading chips.
Commonly seen brands of main control chip include LSISandForce, Indilinx, JMicron, Marvell, Phison, Goldendisk, Samsung, Intel, and so on.

Buffer Chip
It stands next to controller chip. SSD, just as the traditional hard disk, also needs high-speed cache chip to do data management.

Flash Memory Chip
In addition to the main control chip and cache chips, NAND Flash chip occupies most of the rest position on the PCB. NAND Flash chip is divided into SLC (single units) Flash memory, MLC (multiple units) Flash memory and TLC (three units) NAND Flash memory.

Compared with Traditional Hard Disk

The interface specification, definition, function and using method of Solid-state hard disk are almost the same with regular hard disk. The shape and size is also consistent with 2.5-inch regular hard disk.
Solid-state drives have many outstanding features (like fast reading and writing speed, light weight, low energy consumption, small volume, etc) which can not be found in the traditional mechanical hard disk drive. However, its disadvantages are also obvious. For example, it is always expensive and have small storage capacity.
Several main factors that will affect the SSD's performance: the main control chip, NAND flash memory medium and firmware. If the factors mentioned above are all the same, different interface may also influence the performance of the SSD.
The mainstream interface of SSD is SATA (including 3 gb/s and 6 gb/s) interface. And there is also the SSD with PCIe 3.0 interface. The design and reading-writing principle are different from the ordinary hard disk, so the SSD have rather different internal structures. In general, solid state drives (SSD) have relatively simple structure. When it comes to ordinary mechanical disk, things will be more complex. In the process of data reading and writing, the head must be lifted by the air flow which produced by the movement of high speed rotating disk. This can make the head infinitely close to the disk but not contact to it. And then the stepper motor will drive the head to read data saved in different tracks. Therefore, it will not be allowed to dismantled. Once it is disassembled, damages may occur to the hard disk.

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Advantages of SSD

1. The speed of a Solid State Hard disk is fast. As SSD uses flash memory, reading speed is relatively faster than that of traditional hard disk. In addition, there is no head in SSD, so seeking time is nearly 0.
2. Any physical occurrences (such as vibration, high movements or temperature fluctuations) do not affect SSDs to the same degree because there are no moving parts to break.
3. Many SSDs require lower power and produce less heat, resulting in a decrease in electrical usage and a longer lifespan, especially in laptops that are prone to overheating.
4. There is no noise in SSD. Solid-state drives don't have mechanical motor and fan, so the working noise value is 0 db.
Note: high-end or large-capacity devices may have higher energy consumption.
5. The working temperature owns a wide range. A typical hard drive can only work within the scope of 5 to 55 degrees Celsius. However, most of the SSD can work within -10 to 70 degrees Celsius.
6. It is easy to carry. Compared with the conventional 1.8 -inch hard disk, SSD is lighter in weight.

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Disadvantages

1. The largest capacity of SSD is only 4TB.
2. Flash SSD have limited write cycles. It is estimated that these write cycles will last until long after the computer is still being used.
3. The Solid State Disk is much more expensive in gigabyte compared with traditional mechanical hard disk, so an upgrade to the same GB capacity may lead to some considerable costs.