In the purchase of mobile hard disk box is to pay attention to the USB bridge control chip, buy which do not buy GL811 or GL811E, this chip in the intel chipset can be, but in the non-intel chipset above the performance is really too poor, there are a number of friends have regretted, compatible with the performance of the poor, the loss of data transmission; the mobile hard disk is mainly compatibility and data transmission stability! ALI's M5621 is still very good, ISD300 is a real IBM mobile hard disk box used, performance and power consumption are controlled first-class, mobile hard disk box main USB2.0 bridge chip: Century Minsheng (Myson CS8818G), Chuang Wei Technology (Genesys GL811), Yang Zhi Technology (ALi M5621). Most mid-range mobile hard disk enclosures use ALi M5621 chip, which has a good reputation and stable performance. However, since the second half of 2004, more and more mid-range boxes and even high-end boxes have started to use Myson CS8818G, remember that even now you should not buy any box with improved GL chip, the reason is as follows: this low-end chip was basically released in 2001-2002. One of the widely used was the Genesys GL811, which was inexpensive and had low heat. Although this product was certified by USB-IF in January 2002, there are many problems with it, especially with the previous versions of GL811-24, which are especially obvious. First, because of its poor compatibility: in the nForce chipset and via chipset motherboards will have incompatibility problems; Second, in the case of large data stream writing, often reported "write delay error", the hard disk in the process of writing and the host computer disconnected, the host computer can not find the original disk drive; Third, the performance is low, the speed is inferior to other chips! The first is that it is not possible to use a hard drive with the same performance as the other chips.