Edimax Technology PS-2207SUg - Manual (Page 29)

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If you want to set all users have the same authority to share the all
folders in the storage, please select “Read & Write”, “Read Only” or “Not
to Share” here.
Note1: If you have set shared folders and the user’s read/write authority,
the “New Storage Default Sharing Policy” you set here will not enable.
Note2: If the storage has NTFS partitions, all folders in NTFS partitions
are “Read Only” even you choose “Read & Write” here.