ARM Electronics DVRHD OSD - Manual (Page 49)

OSD Setup Manual
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Active
This item indicates if the HDD is added to the database. means the HDD
has been added to the database.
Action
This item allows users to add the HDD to the database or remove it from the
database. The options are (no action), (add the selected HDD to
the database), (remove the selected HDD from the database), and
(format the selected HDD).
NOTE: Before disconnecting an external HDD from the DVR, ALWAYS
remember to remove it from the database first.