What are the advantages and problems of using SSD for pos cash registers?
1. What are the advantages and disadvantages of SSD and HDD?
Like both sides of everything else, SSDs and HDDs have their own advantages and disadvantages. The biggest disadvantage of SSDs today is cost and capacity, and the biggest advantage is performance. In addition, SSDs require less power to perform the same operation, which means the notebook can extend battery life and the data center can save a lot of money. SSDs are also more suitable for mobile devices than HDDs due to their greater resistance to shock. If capacity requirements are not high, SSDs can even be cheaper than traditional hard drives. For example, the lowest-priced netbooks currently use small-capacity solid-state drives. A common SATA hard drive is 80-90MB/s, while the average "seeking time" of KingDisk SSD is only 0.2 milliseconds, while the traditional hard drive is mostly 4 to 15 milliseconds, with a gap of 20 or even 75 times.
Second, the performance of SSD RAID 0? Can RAID 0 be implemented inside SSD?
The performance of building a RAID 0 array using multiple SSDs is considerable, but it is important to note that the RAID controller must meet its requirements. The amount of data that SSDs work in array mode is quite large, and many RAID controllers may not have been designed at this time. The read and write of the SSD itself is done in parallel.
Third, why do people choose MLC particles, is SLC not faster?
Yes, SLC NAND flash is faster, but only when faced face to face can you see a clear difference. Moreover, as long as the parallel read and write mechanism is used on a large scale, MLC can also achieve high speed. Under such circumstances, SSD vendors will definitely pay more attention to cost and capacity issues, and MLC's low-cost and large-capacity will become an advantage.
Fourth, the solid state hard drive and traditional hard drive power consumption comparison
In general, the power consumption is similar when the SSD and HDD are operating at the same high load, or while sleeping. However, SSDs still have some advantages in power consumption. The first SSD does not have a rotating motor inside, so the power consumption in the idle state is significantly lower. Second, since there is no startup time for the speed increase or decrease, the SSD enters the sleep state or wakes up from the sleep state for a shorter and more frequent time. Finally, the SSD can do the same job in less time, so it goes to sleep earlier. These advantages make SSDs actually save power compared to traditional hard drives in actual use.
5. Is there a different level of flash memory? Why is the U disk much cheaper than the SSD of the same capacity?
Indeed, flash memory has different qualities, corresponding to different costs, just like a CPU. U disk generally uses lower-grade flash memory. If you use U disk as hard disk, I think you can feel the performance difference right away. In addition, in terms of reliability, the difference between good and bad flash memory is also obvious, high-quality flash memory chips have much lower error probability throughout the life cycle. Although we can use cheap flash memory to make cheap mobile hard drives, but the reason why there is no good cheap, I think everyone understands.
6. When the solid state drive is full, will performance degrade?
For SSDs, performance has nothing to do with how much data is stored. Whether it's empty or close to full, the wear leveling management algorithm for flash will work as usual. Some common file systems such as NTFS and FAT32 may experience performance degradation when there is insufficient space, but this is a software issue and is not associated with the use of solid state storage. In the future, when a file system specifically for a solid-state hard disk comes out, there may be an example of how much the amount of data stored on the hard disk affects performance.
7. How does the external environment affect the life of the SSD?
Solid-state drives are more resistant to shock and vibration than traditional hard drives due to the lack of moving parts. In addition, since magnetic storage media are not used, there is no danger of data loss due to magnetization. Therefore, if a notebook manufacturer uses a solid state drive, it can save a lot of hard disk shock protection accessories, further saving space and weight inside the fuselage. For desktop PCs, there is no need to worry about any use environment issues with SSDs.
8. How long is the life of a solid state drive?
First, flash is a mature technology that has undergone long-term practical testing. Although flash granules have a certain read and write life, their current technology is far longer than the actual life. For example, official data on KingDisk SSDs show that it has a minimum of 8 years of useful life, regardless of frequency of use. If the application frequency is not high, it can be extended for another 5 years. Secondly, the KingDisk SSD has a two-year warranty on the MLC series, and the SLC series has a three-year warranty. Users can use the KingDisk SSD with confidence.
Nine, SSD need to defragment the disk?
The answer to this question is more complicated. The data storage mode of SSDs is significantly different from that of traditional hard disks. For example, in order to prevent rapid aging due to frequent reading of a certain storage unit, SSDs often use a “loss balance†mechanism to average the number of reads and writes of each block. The current operating system is not prepared for this.
The main principle of Disk Defragmenter is to put data that needs to be read frequently at a place where it can be accessed at high speed, and data that is rarely accessed is piled up in the corners. The principle of SSDs determines that it can find any piece of data very quickly. Current defragmentation tools are powerless to optimize the file system of SSDs. Therefore, it is recommended that SSD users should disable automatic disk defragmentation and do not manually organize them.
10. Which system file is more suitable for SSD?
The current various file systems do not have any optimizations for SSDs. The computer industry has spent decades optimizing the storage of rotating magnetic media, but the emergence of solid-state drives has made these optimizations completely obsolete. Fortunately, at the speed of the current SSDs, following the requirements of the old file system, it works like a traditional hard disk, and there is not much loss. But in the near future, we will definitely see a file system optimized for SSDs.
Microsoft will optimize SSDs in Windows 7, and the system will disable automatic disk defragmentation when using SSDs. The ATA trim command can notify the SSD that a block is no longer used, and the SSD can take back its space and incorporate it into the next "loss-loss" operation.
SSD use help:
1. SSD does a significant speed increase in system disk startup, shutdown or other basic operations. Don't simply read the theoretical speed of reading and writing. SSD is much faster than the seek time of mechanical hard disks. It is faster than mechanical hard disks (even multiple mechanical hard disk groups Raid0) when reading and writing small files frequently.
2, for reading the files on the non-SSD disk, it is basically not helpful.
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