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The importance of speed

Speed is an important indicator of the performance of mobile hard drives, depending on the data transfer rate and speed of the hard drive.
?Data transfer rate
The data transfer rate of the hard disk emphasizes the internal transfer rate the data transfer rate between the hard disk head and the cache , while the mobile hard disk refers more to the data transfer rate of its interface. Because the mobile hard disk is connected to the system through an external interface, the speed of the interface limits the data transfer rate of the mobile hard disk. Although the current USB1.1 interface can provide 12 Mbps; the USB 2.0 interface can provide 480 Mbps; the IEEE 1394a interface can provide 400 Mbp; the IEEE 1394b can provide 800 Mbps data transfer rate, but in practice it will be because of some objective The reason such as the quality of the main control chip used by the storage device, the quality of the board, etc. slows down the transmission rate in the application.
Rotating speed
The average hard disk speed of a household is generally 5400 pm, 7200 rpm, etc. High-speed hard disk is the first choice for desktop users; for notebook users, it is 4200 rpm, 5400 rpm, although a company has released a 7200 rpm notebook hard disk. But it is still relatively rare in the market.
The mainstream 2.5-inch brand mobile hard disk has a read speed of about 15-25MB s and a write speed of about 8-15MB s. If you copy a 4GB DVD movie to the mobile hard disk at a write speed of 10MB s, it takes about 6 minutes and 40 seconds; if you copy a 4GB DVD from the mobile hard disk at a read speed of 20MB s. It takes about 3 minutes and 20 seconds for the movie to go to the hard disk of the computer.

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