USB flash drive as a favorite IT products, and consumers of daily work, life is closely related to its capacity and read speed is more widely concerned. So what is the capacity and read speed of the USB flash drive?
In the regular shopping malls or supermarkets to buy USB flash drive products, USB Flash Drive choose a reputable brand, do not seek cheap cheap business in the channel to buy. Select the product carefully check the product packaging on the identification of information, select the logo information than the whole product, pay attention to product appearance and packaging and manual printing quality.
At the time of purchase to consider the USB flash drive capacity, speed, brand, price, service and other factors, according to the purpose of different use to buy different grades of products, USB Flash Drive while proper preservation of shopping vouchers in order to quality problems can effectively maintain their own The legitimate rights and interests.
USB flash drive is also known as solid-state hard drive, is a new generation of disk. USB flash drives use the same shape and connectors as traditional mechanical disks to use USB flash drives in storage enclosures instead of traditional mechanical disks. USB flash drives use semiconductor-based solid-state storage to access data. Compared with the traditional mechanical disk, USB flash drive does not contain moving parts, USB Flash Drive so there is no seek time and rotation delay. In addition, because it is based on semiconductor devices, USB flash drives are more power efficient than mechanical disks. Key components of USB flash drives include controllers, I / O interfaces, mass storage and caching. The controller is used to control the operation of the USB flash drive. The I / O interface provides power and data access for USB flash drives. Bulk storage consists of a set of nonvolatile NAND flash memory chips used to store data. The cache provides temporary storage for the data.
USB flash drives offer high performance to meet the needs of performance-sensitive applications. It has multiple parallel I / O channels for data access. In general, the greater the number of flash memory chips and channels, the greater the internal bandwidth of the USB flash drive, and the higher the performance. USB Flash Drive The memory chips in the flash memory are organized in blocks and pages as logical units. The page is the smallest object that can be read and written on a USB flash drive. The pages are combined into blocks. Each block can have 32, 64, or 128 pages. The size of the page is not the only standard, the common size of 4KB, 8KB and 16KB. The read of the USB flash drive occurs at the page level, and the write occurs at the block level. The USB flash drive simulates the logical block address of the physical disk, occupying a series of consecutive physical blocks per page. For example, a page with a size of 4KB occupies 8 consecutive 512-byte data blocks. USB flash drives are suitable for applications where the file blocks are small, USB Flash Drive random reads are more work, and require response times to remain low. Applications that require rapid processing of large amounts of data or real-time data processing can dramatically improve performance when using USB flash drives.