The difference between the flash drive and the U disk

Document One:

Basically is no different from what we're talking about the U disk, is to read and write directly to the memory, and for Flash, the definition of the scope is not the same, it requires external devices to access, such as the phone's flash memory card, digital camera, such as flash memory card is just a card, the computer can not directly visit the need to call a "card reader" External equipment to identify, flash card has a variety of, such as XD, ask, this CF, SD, SM, etc., so the reader has a "more than one" function, you can read and write different Flash memory cards. Simply put, is the scope of the flash drive than u disk, u disk is a flash disk.

Document II:

The flash drive is a miniature high-capacity Removable Storage product that uses a USB interface without physical drives, and uses a storage medium for flash memory (Flash Memory). The flash drive does not require additional drives, and the drive and storage media are combined to store the read and write data independently as long as the USB interface is connected to the computer. The flash drive is small, thumb-like size, light weight, about 20 grams, and is especially suitable for carrying. There is no mechanical device in the flash disk, and the seismic performance is very strong. In addition, the Flash disk also has moistureproof magnetic, high and low temperature (40°c ~ +70°c) and other characteristics, safety and reliability is very good.

The flash drive only supports USB ports, which can be plugged directly into the computer's USB interface or connected to your computer via a USB cable (with A-type Plug and a-type receptacle).

The flash drive has two main uses: first, it can be used to exchange files larger than 1.44MB between computers that do not have a network, such as exchanging documents between units and units, units and families, and between individuals and individuals. With a flash drive, the unit does not complete the work can be taken home to continue to do, with a flash drive, you can bring large design documents to the customer where there is a flash drive, can be downloaded on the unit on the frequency of the image or MP3 file home. Second, it can be used to replace the floppy drive on a portable computer. Business people who travel a lot with laptops have a headache, and the floppy drive has a lot of weight. With the flash drive, you can exchange file data with customers anytime and anywhere, and then say goodbye to the floppy drive. So that the business trip easy and enjoyable, mobile office efficiency doubled.

The flash drive can be erased at least 1,000,000 times.

The data in the flash drive can be stored for at least 10 years.

In theory, a computer can receive 127 flash drives at the same time, but because the drive letter uses 26 English letters and the existing drive takes up several English letters, it can receive up to 23 flash drives (excluding A, B, C) and requires the assistance of the USB hub.

Document Three:

"Flash drive" is the product of the earliest name, now its name is already everywhere, many countless, what "flash disk", "Carry Q" and so on. The original USB drive was a new type of storage device invented by NETAC, because it does not require additional physical drives and is large in size, from 16M to 2GB, breaking the limits of floppy disk 1.44M. Speaking from reading and writing speed, USB flash drive using USB1.1 or 2.0 interface standards, read and write faster than floppy disk greatly improved. From the stability, the USB drive has no mechanical read and write device, to avoid the mobile hard disk easy to touch, fall and other causes of damage (I believe you must also have important documents to be destroyed by the hateful floppy disk experience). Because of the use of USB interface, it can be hot plug, no external power supply, only the size of the thumb, weighing about 20 grams, very convenient to carry, any computer with USB interface can use USB flash drive. Later, USB flash drive This storage use of things by many companies bullish, a term-flash was born.

A flash drive can be used to exchange data between computers. In terms of capacity, the capacity of the flash drive is optional from 16MB to 2GB, breaking the limitations of the floppy disk 1.44MB. From reading and writing speed, the flash drive USB interface, read and write faster than the floppy disk much higher. From the stability, the flash drive has no mechanical read and write device, to avoid the mobile hard disk easy to touch, fall and other causes of damage. Some styles of flash memory disk with encryption and other functions, so that users more personalized use. The flash drive is compact and easier to carry.

Flash memory is a long-term dynamic non-volatile memory that can be deleted and adapted in a storage unit called block. Flash memory is a variety of electrically erasable read-only memory (EEPROM), the EEPROM and Flash is different, it can be deleted and rewritten at byte level, so the EEPROM is slower than the update speed flash. Flash memory is often used to save control code, such as the basic input and output system (BISO) in a personal computer. When the BIOS needs to be changed (rewritten), the flash memory can be written to block (not byte) size, making it easier to update. On the other hand, flash memory is not as useful as arbitrary access memory (RAM), because arbitrary access memory must be at the level of byte (not block) to set the address.

U disk

U disk is a flash memory, also known as Flash disk, USB drive, the biggest feature is: small, large storage capacity, cheap. is one of the removable storage devices. The general U disk capacity has 64M, 128M, 256M, 512M, 1GB, 4GB, 16GB and so on. It is portable storage device, so it is not in the chassis, so we can hang it in front of the chest, hang it on the keychain, and even put it in the wallet.