Electronic Hard Disk(DOM Disk)
Electronic hard disk exist in the form of computer expansion cards (one is the form of computer expansion cards, mainly ISA card structure, the earliest electronic hard disks are this way. The other is the interface mode, mainly IDE mode. The memory types of both electronic disks are integrated circuit chips, so the speed and reliability of ordinary disks are incomparable) and work by inserting the motherboard bus slot. When the computer is inserted into the electronic disk, the system can start from the electronic hard disk. Because the information of the electronic hard disk exists on the chip, it has the advantages of high speed, stability and confidentiality.
Because of its fast working speed, high stability and strong confidentiality, the electronic hard disk is often used in special purpose machines and industrial control machines. The capacity of an electronic hard disk is 32-16GB, and the electronic hard disk we have developed is 1M bytes. “Electronic Hard Disk” is composed of Flash flash media and control IC. It is a kind of memory that can be read and written many times. Because its performance principle has many relations with electronics, we simply call it “Electronic Hard Disk”, which makes it easier for users to understand its performance principle. “Electronic hard disk” uses IDE interface, so it is very convenient to install and use. Since the storage media is flash memory, its shock resistance is much better than hard disk; Faster and lighter than hard drives, they are ideal for mobile use. The most common electronic hard drive is Flash. We call it an electronic hard disk because it has the same interface specification, definition and usage as a regular hard disk. Includes: IDE, SCSI, Fibre Channel, etc. The product is also identical in shape and size to regular hard drives, including 3.5 “, 2.5”. 1.8 “Multiple types. Because electronic hard disks do not have rotating media for ordinary hard disks, they are highly resistant to vibration and work at wide operating temperatures. Extended temperature electronic hard disks can work at -40C-+85C. They are widely used in network computers (NCs) , industrial control, aerospace, military, navigation equipment and other fields. Now with broadband and high speed Internet access, users will download a large number of files, and an electronic hard disk is the most appropriate choice when you need to store your data on another computer.
Solid State Hard Disk (SSD Disk)
Solid State Disk (Solid State Disk or Solid State Drive), also known as electronic hard disk or solid state electronic disk, is a hard disk composed of a control unit and a solid state storage unit (DRAM or FLASH chip). Because solid state hard disks do not have rotating media for ordinary hard disks, they are highly resistant to shocks.
There are two kinds of storage media for solid-state hard disk, one is using flash memory (FLASH chip) as storage media, the other is using DRAM as storage media.
Flash-based solid-state hard disks (IDE FLASH DISK, Serial ATA Flash Disk):
FLASH chips are used as storage media, which is also commonly referred to as SSDs. 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 hard disk is that it can be moved, and the data protection is not controlled by the power supply. It can be adapted to various environments, but it has a low service life and is suitable for personal users. In flash-based solid-state hard disks, storage units are divided into two categories: SLC (Single Layer Cell single-layer unit) and MLC (Multi-Level Cell multi-layer unit). SLC is characterized by high cost, small capacity, but fast speed, while MLC is characterized by large capacity and low cost, but slow speed. Each unit of MLC is 2 bits, which is almost twice as large as SLC. However, since each MLC storage unit stores more data and is relatively complex in structure, the probability of errors increases, and error correction is required, resulting in a large performance lag behind that of simple SLC flash memory. In addition, the advantage of SLC flash memory is that the number of copies can be as high as 100,000, which is 10 times higher than MLC flash memory. In addition, to ensure the lifetime of MLC, control chips check and smart wear balance technology algorithms, so that the number of writes per storage unit can be shared equally to 1 million hour failure interval (MTBF).
DRAM-based solid-state hard disks:
DRAM is used as storage media and has a narrow application range. 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 hard disk 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.
