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Can I use different sized/typed disks for my array?
Yes, but for all levels (except JBOD) you will lose some capacity on the largest drives.
For level 0, total capacity is equal to the stripe width times the smallest drive.
For level 1, total capacity is equal to the smallest drive.
For level 0+1, total capacity is equal to the stripe width times the smallest drive.
For level 5, total capacity is equal to the number of drives minus 1 times the smallest drive.