Atlantis DISKMASTER NAS65020 - Manual (Page 60)

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Invalid Accounts, it will be considerate as Invalid
Accounts. Therefore in case of conflict: Invalid>Valid
 DiskMaster uses the following order of importance:
Invalid>Valid-> Write>Read
When you create a shared folder, you can redirect to a partition
larger than the root partition.DiskMaster supports up to 4 folders
redirected. This type exists only when you are not using
RAID1/0 mode and the system has 2 hard disk.
In shared Folders you will see Mount Partition close to the
redirected to a primary partition.