Buffalo Technology TeraStation Pro II TS-HTGL/R5 - Manual (Page 17)

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Select Guest and click on Connect. Note: If you have configured share
permissions on your TeraStation, select Registered User and enter your
Registered User credentials.
Accessing TeraStation Data from a Mac
Select the volume that you want to mount, such as share.or.share-mac,
from the list of folders on the TeraStation.
The share will open. A link to the shared folder will appear on your
desktop.