Buffalo DriveStation HD-QH8TU3R5-EU User Manual page 17

Formatting
4
Click . Select Show All Devices.
5
Click the disk to be formatted.
Note: Formatting will erase all data on the disk. Don't format the wrong disk!
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Click Erase.
7
Configure each setting as below.
(1) Select Mac OS Extended (Journaled).
(2) Select GUID Partition Map.
(3) Click Erase. Formatting will begin.
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