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A storage array consists of a large number of disk drives together with a storage controller. Many servers can be connected to a storage array, which allows any of the disk drives to be used by any server. Data is read from the disk and written to the disk with a read/write heads (Figure 1). The disk spins at between 7,200rpm and 15,000rpm. The heads are moved across the recording surface of the disk to different tracks where the data is stored.