The difference between a mobile hard disk and a U disk: different size, different storage size, different prices, different principles of storage, different energy consumption. First, the size of different U disk volume is very small, the weight is also very light, very suitable for carry; mobile hard disk volume is slightly larger, important also in 500 grams or more, not good to carry. Second, the storage size of different U disk storage space is small, generally not more than 1G, more than a few dozens of hundreds of M; mobile hard disk storage space is larger, generally hundreds of G's. Third, the price of different U disk selling price is very small, the weight is also very light. Third, the price of different U disk is generally sold at about 100 yuan; mobile hard disk is sold at more than 300 yuan. Fourth, the principle of different storage U disk is to semiconductor materials (chips) as a storage unit, also known as solid state memory, no mechanical parts. Mobile hard disk is a magnetic medium as memory, there is a mechanical part. Fifth, energy consumption is different U disk does not have a mechanical part, the need to provide much less energy compared to the general will not exceed 100mA, while the mobile hard disk energy consumption is relatively large, there are times when a USB port to provide the current can not be very good to ensure its normal operation. Therefore, the mobile hard disk is generally equipped with a data cable can check two USB ports, and even need to configure a special power supply. This is the main reason why some mobile hard disk does not work properly. Mobile hard disk: Advantages: large capacity; USB interface, convenient storage, mobile and portable, the price is relatively cheap compared to ordinary hard disk. Disadvantages: afraid of falling, bumping, vibration, water life: the theoretical life of the mobile hard disk more than 30,000 hours, normal use of 10 years no problem, the general hard disk has been on the work of 3 years. u disk: advantages: mini and compact, easy to carry; easy to read and write disadvantages: small easy to lose; capacity is small, it is difficult to store large amounts of data; transmission speed is slow; life: the general use of MLC particles of the disk can be erased more than 10,000 times, while the use of SLC particles of the service life of the disk is even more. SLC particles U disk life is up to 100,000 times, but the U disk does not read and write. Comes with a power saving mode that just forces the set temperature to run between 25~28 degrees.