Buffalo Cloudstor CS-X series User Manual page 38

Adding an External USB Drive
You may connect an external USB drive to your CS-WX or CS-WV CloudStor for additional
storage or backup. Before connecting the USB drive to the CloudStor, use your computer to
format it with NTFS or HFS+. Use NTFS if you are formatting with a Windows computer or HFS+
if you are formatting with a Mac.
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