USB On the Go, for HTC

If your Android support USB OTG, you can access USB Storage via USB OTG cable. (Please notice that not all devices support this feature)

Here is a post describe using of USB On the Go for HTC device from HTC Blog: http://blog.htc.com/usb-otg/

• First, get your USB OTG cable ready
• Plug your USB drive into the USB port on the cable, then plug the cable into your phones microUSB port.
• Now you can access the data on your USB drive through your HTC smartphone. Using USB OTG, you can use apps like Gallery, Music and Polaris Office to easily access files on your USB drive and your smartphone.
• When you’re done, you can quickly check available storage on your USB drive by going to Setting > Storage on your HTC phone.  Also, don’t forget to unmount your USB drive when you’re finished.