RAID - Redundant Array of Inexpensive (or sometimes "Independent") Disks - is a method of combining several hard drives into one logical unit. It can offer fault tolerance and higher throughput levels than a single hard drive or group of independent hard drives. Learn more
Input an estimate of the amount of storage you will need. Your available storage capacity will decrease depending on the RAID level you choose. Do not include hot spares in your raw storage calculation.
Input the amount of data you currently have in use. This will be used to generate an estimate on the number of disks you will need for this amount of available storage, after accounting for the RAID level.