Vantec NST-400MX-SR User Guide - Page 17

JBOD Mode： It concatenates a series of physical hard drives as a single large volume; resulting in a seamless expansion of virtual volumes beyond the physical limitations of singularly connected hard drives. Hard drive A and B are concatenated into a single virtual volume in the figure below with a storage capacity that is equal to the sum of each of the physical hard drives A and B. It is also possible to create a JBOD volume using only a single hard disk drive connected to Port 0, and then increase the storage capacity of the volume later by adding another hard disk drive to Port 1 and pressing reset button. The new disk blocks of Port 1 will be concatenated to the end of the disk blocks of Port 0, and any data that is stored on the existing JBOD volume will be preserved. However, it is not possible to expand an existing JBOD volume by adding another hard disk drive to Port 0 and still preserve any existing data on that volume. JBOD 500GB JBOD 1000GB NST-400MX-SR Port 0 Port 1 ＋ Drive A Drive A 250GB 250GB Equal hard drives NST-400MX-SR Port 0 Port 1 Drive A 250GB Drive A 750GB Unequal hard drives RAID Mode Selection 16