How to distinguish USB disk and card reader

In simple terms, u disk is a memory card reader, but U disk because the chip is directly welded on the PCB board, plus a better brand makes good u disk reading speed is guaranteed, card reader plus storage card can be used as a U disk.

u disk, full name USB flash drive, English name "USB Flash Disk". It is a USB interface with no physical drive of the micro-high-capacity mobile storage products, through the USB interface to connect with the computer to achieve Plug and play. U disk's name is originated from Netac technology production of a new type of storage equipment, known as "USB", using USB interface to connect. U disk connected to the computer's USB interface, u disk data can be exchanged with the computer. And after the production of similar technology equipment due to NETAC has been patent registration, and can not be called "flash Drive", and renamed homophonic "U Disk". Later, the U disk this name because of its simple and easy to remember and thus widely known, is one of mobile storage devices.

Reader (reader) is a specialized device. There are slots to insert a memory card, and ports can be connected to the computer. When the appropriate storage card is plugged into the slot, the port is connected to the computer and the required driver is installed, the computer treats the memory card as a removable memory, which allows the card to be read and written to the reader. According to the type of compatible memory card can be divided into CF card reader, SM card reader, Pcmica card reader and Memory stick reader, as well as double slot reader can use two or more cards at the same time, according to the port type can be divided into serial card reader (slow, very rare), Parallel port card reader ( For early motherboard computers), USB card reader (fast, easy to use).