Rosewill R2-RAID - Manual (Page 11)

Server RAID System [ R2-RAID ] User Manua
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JBOD MODE ：It enables each hard drive to be seen separately as a single
drive. When using a SATA host controller, JBOD should only be used if the
SATA host controller provides Port Multiplier (PM) support. If a host is not
PM-aware, only a single drive is presented (drive A). No such limitation if
using a USB host connection.
Drive A
Drive B
HD3206SRD
Port 0 Port 1
Volume B
Volume A
Drive A Drive B
HD3206SRD
Port 0 Port 1
Volume B Volume A
Equal hard drives Unequal hard drives