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). The interface specifications and definitions, functions and usage of solid-state drives are the same as those of ordinary hard drives, and the product appearance and size are also consistent with ordinary hard drives. Because SSDs do not have the rotating media of regular hard drives, they are extremely resistant to shock. The operating temperature range of its chip is very wide (-40~85 degrees Celsius). Currently widely used in military, vehicle, industrial control, video surveillance, network monitoring, network terminals, electric power, medical, aviation, navigation equipment and other fields. At present, due to the high cost, it is gradually popularized in the DIY market.
Hongqin (Beijing) Technology Co., Ltd. is located in the core area of ??Zhongguancun, Beijing. It is a professional IC device sales company.
Its main business is the agency and distribution of electronic components. And we have the best and most professional engineering and technical elites in the industry to provide customers with professional and timely technical solutions. The products are positioned for a variety of purposes.
The main brands are WEDC (White Electronic Designs Company) and Runcore-Disk series electronic hard drives.
We also operate CYPRESS, XILINX, ISSI, MAXIM, TI and other internationally renowned brands
Our electronic hard drive parameters are as follows:
Feiyu III series products
Interface SATA PATA
Size 2.5 ″
Capacity 512MB to 128GB
Maximum sustained writing speed ①
SATA: 90-120MB/s PATA: 40-50MB/s
Maximum sustained read speed②
SATA: 120-150MB/s PATA: 50-60MB/s
Burst transfer speed 180MB/s
Power consumption working mode: SATA 320mA/5.0V PATA 190mA/5.0V
Sleep mode: SATA 220mA/5.0V PATA 70mA/5.0V
Operating temperature commercial grade (0℃ ~+70℃)
Industrial grade (-20℃~+70℃)
Wide temperature grade (-40℃~+85℃)
Storage temperature -40 ℃ to +85℃
Weight ③ lt; 120g
Reliability MTBFgt; 5,000,000 hours,
Comply with MIL-STD-810F GJB150 GJB322A- 98
Embedded Flash file system, built-in 4-digit ECC check
Extended protection with user-customizable serial number; data secure destruction (optional)
Earthquake resistance The performance is 1500G instantly, and the average is 15G
[Edit this paragraph] Classification
The storage media of solid-state drives are divided into two types. One is to use flash memory (FLASH chip) as the storage medium, and the other is to use flash memory (FLASH chip) as the storage medium. One is to use DRAM as the storage medium.
Flash memory-based solid state drives (IDE FLASH DISK, Serial ATA Flash Disk): use FLASH chips as the storage medium, which is what we usually call SSD. The 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, but its service life is not long, so it is suitable for individual users. In flash memory-based solid-state drives, storage cells are divided into two categories: SLC (Single Layer Cell) and MLC (Multi-Level Cell). SLC is characterized by high cost, small capacity, but fast speed, while MLC is characterized by large capacity, low cost, but slow speed. Each unit of MLC is 2 bits, which is twice as much as SLC. However, since each MLC storage unit stores a large amount of data and has a relatively complex structure, the probability of errors will increase and error correction must be performed. This action causes its performance to lag significantly behind that of SLC flash memory with a simple structure. In addition, the advantage of SLC flash memory is that it can be copied up to 100,000 times, which is 10 times higher than MLC flash memory. In addition, in order to ensure the life of the MLC, the control chip is calibrated and the intelligent wear-leveling technology algorithm allows the number of writes to each storage unit to be evenly amortized, reaching 1 million hours between failures (MTBF).
DRAM-based solid state drive: DRAM is used as the storage medium, and its current application range is narrow. 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 with a long service life. The only drawback is that it requires an independent power supply to protect data security.
[Edit this paragraph] Advantages of solid-state drives
Compared with ordinary hard drives, solid-state drives have the following advantages:
1. Fast startup, no motor to accelerate rotation process.
2. No need for magnetic heads, fast random reading, and minimal read delay. According to relevant tests: When two computers have the same configuration, the notebook equipped with a solid-state drive only takes 18 seconds from booting to the desktop, while the notebook equipped with a traditional hard drive takes a total of 31 seconds. There is almost a gap of nearly half.
3. Relatively fixed reading time. Because seek time is independent of where the data is stored, disk fragmentation does not affect read times.
4. DRAM-based solid state drives have extremely fast writing speeds.
5. No noise. Because there is no mechanical motor or fan, the noise level during operation is 0 decibels. Some high-end or high-capacity products have fans installed, so they can still produce noise.
6. Low-capacity flash memory-based SSDs have low energy consumption and heat generation during operation, but high-end or large-capacity products will consume higher energy.
7. There are no mechanical moving parts inside, there will be no mechanical failure, and there is no fear of collision, impact, or vibration. This will not affect normal use even when moving at high speed or even with flipping and tilting, and it can minimize the possibility of data loss when the laptop is accidentally dropped or collides with a hard object.
8. Wider operating temperature range. A typical hard drive can only operate within a range of 5 to 55 degrees Celsius. Most solid-state drives can work in -10~70 degrees Celsius, and some industrial-grade solid-state drives can also work in -40~85 degrees Celsius, or even larger temperature ranges.
9. Low-capacity solid-state drives are smaller and lighter than hard drives of the same capacity. However, this advantage gradually weakens as the capacity increases. Up to 256GB, SSDs are still lighter than regular hard drives of the same capacity.
[Edit this paragraph] Disadvantages of solid-state drives
Compared with traditional hard drives, solid-state drives have the following disadvantages:
1. High cost. The price per unit capacity is 5 to 10 times that of traditional hard drives (based on flash memory), or even 200 to 300 times (based on DRAM).
2. Low capacity. The current maximum capacity of solid-state drives is much lower than that of traditional hard drives.
The capacity of solid-state drives is still growing rapidly, and IBM is said to have tested a 4TB solid-state drive.
3. Because it is not shielded in a Faraday cage like traditional hard drives, solid-state drives are more susceptible to the adverse effects of certain external factors. Such as power outage (especially DRAM-based solid state drives), magnetic field interference, static electricity, etc.
4. Limited write life (based on flash memory). Generally, the write life of flash memory is 10,000 to 100,000 times, and specially-made ones can reach 1 million to 5 million times. However, the number of writes to some parts of the file system (such as the file allocation table) during the entire computer life will still exceed this limit. A special file system or firmware can share the writing location, making the overall life of the solid state drive more than 20 years.
5. Flash-based SSDs are much slower at writing than traditional hard drives and are more susceptible to write fragmentation.
6. It is difficult to recover data after it is damaged. If the hardware is damaged using traditional disk or tape storage methods, current data recovery technology may be able to save some data. But if an SSD is damaged, it's almost impossible to retrieve data from a failed (especially DRAM-based), broken or punctured chip using current data recovery technology.
7. According to actual tests, the battery range of laptops using solid-state drives is shorter than that of 2.5-inch traditional hard drives using 7200RPM when running at idle or low load.
8. DRAM-based solid-state drives consume higher energy than traditional hard drives at any time, especially when powered off, they still need power, otherwise data will be lost.
9. According to user reports, solid-state drives using cheap MLC run slower than traditional hard drives under the Windows operating system. This is because the file system mechanism of the Windows operating system is not suitable for SSDs. There is no such problem under Linux.
[Edit this paragraph] Solid-state drive products
Existing solid-state drive products include 3.5-inch, 2.5-inch, 1.8-inch and other types, with capacities generally ranging from 16 to 256GB. General flash drives (U disks) are large. The interface specifications are consistent with traditional hard drives, including UATA, SATA, SCSI, etc.
At CES 2008, professional solid-state drive manufacturer BitMicro Networks demonstrated the internal structure of a professional-grade solid-state drive product using a SCSI interface (see the picture on the right). This product has 32 TSOP packaged NAND flash memory chips welded onto a PCB. BitMicro revealed that the average price of this product is about US$10 per GB, which is about five times that of mainstream mechanical hard drives.
In 2008, Netac also launched what is known as the “first domestic” solid-state drive product. Yizheng claims to have launched China's first solid-state drive product in 2007. Immediately afterwards, Zhongji Weiye also launched a solid-state drive product known as the "world's fastest", and Micron launched a solid-state drive with a speed of 1GB/S (using solid-state drives as arrays).
Comparison of the advantages and disadvantages of traditional hard drives and solid-state hard drives
1. Shockproof and drop resistance: Current traditional hard drives are all disk-type, and data is stored in disk sectors. The solid-state drive is made of flash memory particles (that is, current memory, MP3, U disk and other storage media), so there are no mechanical parts inside the SSD solid-state drive, so even if it moves at high speed or even with flipping and tilting, it will not Affects normal use, and can minimize the possibility of data loss in the event of collisions and shocks. Compared with traditional hard drives, solid hard drives have an absolute advantage.
2. Data storage speed: Judging from the evaluation data of the PConline evaluation room, the performance of solid-state drives is more than 2 times higher than that of traditional hard drives.
3. Power consumption: The power consumption of solid-state drives is also better than traditional hard drives.
4. Weight: Solid-state drives are lighter in weight, 20-30 grams lighter than conventional 1.8-inch hard drives.
5. Noise: Since Solid Hard has no mechanical parts and flash memory chips, it has the characteristics of low heat generation and fast heat dissipation. It also has no mechanical motors and fans, and the operating noise value is 0 decibels. Traditional hard drives are much inferior.
6. Price: Currently, the price of 80G Intel SSD on the market is about 4,000 yuan. This price is enough to buy several traditional hard drives with a capacity of 1TB.
7. Capacity: The current maximum capacity of solid-state drives is only 256G, which is far behind the maximum capacity of traditional hard drives measured in TB.
8. Service life: SLC has only a read and write life of 100,000 times, and low-cost MLC has a read and write life of only 10,000 times; it has no advantage over traditional hard drives.