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A brief introduction to mobile hard drives

The size of the mobile hard disk is divided into 1.8 inch, 2.5 inch and 3.5 inch. The 2.5-inch mobile hard disk box can use the laptop hard disk. The 2.5-inch mobile hard disk box is small in size, light in weight, easy to carry, and generally has no external power supply.
Most of the mobile hard drives are USB interfaces, but due to the limited capabilities of the USB interface, the 2.5′ hard drive used by the mobile hard disk is actually different from the hard disk used in the notebook. The notebook requires a quick start of the hard disk, so the starting current of the notebook hard disk is larger, about 900 mA. The boot time of the moving hard disk is slightly longer, and the starting current is smaller, generally about 700 mA. So if you assemble your mobile hard disk, you still need to find a special mobile hard disk version of the core.
The 3.5-inch hard disk box uses a desktop computer hard disk, which is large in size and relatively inferior in portability. The 3.5-inch HDD box usually comes with an external power supply and a cooling fan.
High speed
Mobile hard drives mostly use USB, IEEE1394, eSATA interfaces, which can provide high data transmission speed. However, the data transmission speed of the mobile hard disk is limited to the interface speed to a certain extent, especially in the products of the USB 1.1 interface specification, when the transmission of a large amount of data, the user’s patience will be tested. USB2.0, IEEE1394, eSATA mobile hard disk interface is relatively much better. The USB2.0 interface transfer rate is 60MB s, the USB3.0 interface transfer rate is 625MB s, and the IEEE1394 interface transfer rate is 50~100MB s.
When exchanging data with the host, it takes only a few minutes to read a large file of the order of GB, which is especially suitable for the storage and exchange of video and audio data.

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