Buffalo TeraStation HS-DTGL/R5 User Manual page 46

Mapping Multiple Shares
If only unrestricted shares are being mapped, then it's not necessary to set a username and
password for shares. Multiple mapped drives to unrestricted shares can exist without a username
or password as long as no restricted, secure shares are mapped.
When mapping any share, select the Connect using a different
user name option. A login and password prompt will appear.
Use the username and password required by any secure,
restricted.shares.for.all shares. All mapped shares must use
the same username and password!
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Advanced Settings