Western Digital My Cloud EX2 ユーザーズマニュアル

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MANAGING STORAGE ON WD MY CLOUD EX2
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WD MY CLOUD EX4 PERSONAL CLOUD STORAGE
USER MANUAL
5.    Select the RAID mode you’d like to use for your WD My Cloud EX2 device.
 
Options include:
6.    Select the Switch to <RAID Mode> check box, and then click Next.
 
7.    Review the status of your hard drives, and then click Next
JBOD
The use of one or more drives not in a RAID configuration but 
managed as separate logical volumes.
Spanning
Combination of drives in a linear fashion to create one large logical 
volume.
RAID 0
Data is striped across multiple hard drives, enabling accelerated 
reading and recording of data by combining the work of two or more 
drives to increase performance.
RAID 1
Two instantaneous copies of the data are recorded on separate hard 
drives so if one of them fails, other(s) continue to read/write data until 
the faulty hard drive is replaced.