CCTV Camera Pros Viewtron Video Surveillance DVRs - HD-SDI and Standard Definition CCTV Recorders - Manual (Page 45)

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Storage Manager
From here you can format both internal Storage (SATA HDD) and USB external Storage.
“All formats” is available only for Internal (SATA).
When installing an unformatted new HDD, “New” HDD Icon is shown.
When formatting new HDD, it is added to new HDD for recording.
DVD backup will require about 5G of HDD of storage.