PLANET NVR-3250 - Manual (Page 48)

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Once a RAID volume is created, the “Delete RAID" option should be presented in the “Disk Action”
drop-down menu. (Regardless the RAID volume has been formatted or not)
Only RAID1 and RAID 5 have repair function
The recording should continue even when RAID 1 or RAID 5 volume fails or is rebuilding.
The replacement hard drive size must be larger or equal to the size of the smallest disk in the
volume.
The internal disks do not need to be formatted prior to creating RAID volume
Create RAID with an existing RAID volume is not allowed
Once a RAID volume is deleted, all internal disks within that RAID should become offline and need
to be formatted again before they can be used individually.
All internal disks (or RAID volumes) need to be formatted before they can be used.