NEC Express5800/R110i-1 Maintenance Manual page 150

Chapter 2 Useful Features
4-2. New creation (RAID10)
1)
150
Select "RAID10" for Select RAID Level.
Select "Select Drives" under Span1, and then select the device type for Select Media Type.
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Note The Both option is not available.
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The options for Select Media Type vary depending on the connected device.
Express5800/R110i-1, T110i-S, T110i Maintenance Guide
5. RAID System Configuration