{HEAD ~ The plurality} of {TAIL ~ disk devices} are configured from a first disk device group and a second disk device group having different performance to the first disk device group, typically composed of a SAS specification hard disk device group and a SATA specification hard disk device group 
{ HEAD ~ The plurality } of { TAIL ~ disk devices } are configured from a first disk device group and a second disk device group having different performance to the first disk device group , typically composed of a SAS specification hard disk device group and a SATA specification hard disk device group
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