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   ocr: RAID 3 AND RAID 4 Logical sector 1 Logical sector 2 Logical settor 3 Dota Controller from server Logical sector 4 Parity block Figure 5: An Hustration OfRAID levels 3 and 4. Each ofthe drives (1 througb 1-1, m this sase n-)) is acessed in a stripe set; tbe. last drive is dedicated to storig the parity data. The fanctional distinction berieen RAID levels 3 and 4 iS tbat RAID Baddresses each drive at a byte level, abile lecel 4 iddresses tbe dives at a bloce level. Note that in both cases only one srite operation cne OrCE at a time because oftbe dedicated parity drnue: i RAID 3, enly one read op ...