being a handheld device, Galaxy Tab 10.1 will not be having any USB host properties. This means you can not attach external USB hard drive which requires power from USB source. Rather Galaxy Tab 10.1 will be USB client only. Once connected with the help of its docking station to USB port of a computer, Galaxy Tab 10.1 will be detected as an external storage device just like a pen drive. This will facilitate an easy data transfer for you when you don't have a WiFi or a 3G network. Read the Galaxy Tab 10.1 and iPad 2 Thickness war
As the web gets flooded with new "hands on" videos and various previews and reviews of Samsung Galaxy Tab 10.1 , one thing gets murkier ; its USB connectivity. Even though official specifications say that this new galaxy tab will have a USB 2.0 connectivity, people are not able to find a USB connector anywhere in the device. Many of the comments in Engadget review and on other popular technology blogs show the same concern, if there is no USB in Galaxy 10.1 people are not going to buy it. After doing a bit of googling and watching various youtube videos, this is what i got to know about USB connectivity of Samsung Galaxy Tab 10.1, Galaxy Tab 10.1 has got a proprietary connector which does not look like usual USB connectors. The dock as shown in this video doubles as USB connector too.