D-Link DSL-3900 User Manual page 84

Section 5 - Connect and Share a USB Device
Step 2 - Enter the DSL-3900's IP address and the name of the USB volume you wish to share.
For example smb//192.168.1.1/usb1_1.
Click Connect.
If you have multiple USB storage devices attached via a USB Hub, consult the HOME>USB sectionof the DSL-3900's Web
Configuration utility for a list of available volume names.
D-Link DSL-3900 User Manual 80