User manual

SPAN (combine Mode)
Spanning provides another maximum capacity solution, which
some call it as “Large”. Spanning combines multiple hard drives
into a single logical unit. Unlike Striping, Spanning writes data to
the first physical drive until it reaches full capacity. When the
first disk reaches full capacity, data is written to the second
physical disk. Spanning provides the maximum possible storage
capacity, but does not increase performance.
BIGROC 5C 4Bay RAID - 1U Rack Mount System - User Manual Page | 21