www.gateway.com41DrawbackRAID 1 treats the entire array as a single drive with the storagecapacity of the smallest physical drive in the array. So if youhave two drives (300 GB and 250 GB) in a RAID 1 array, yourcomputer only recognizes a single drive with 250 GB totalcapacity.RAID 5 and 10 for both performance andsecurityUnderstanding RAID 5RAID 5 uses striping (at the file level) with on-the-fly errorcorrection across all drives. Because of this error correction,small file read/write errors can be quickly and automaticallyfixed without a significant drop in system performance. RAID 5offers good performance and data redundancy. This arraypreserves your files if a drive fails.RAID 5 stripes both data and parity information (error-checkinginformation) across multiple drives. Striping across drivesimproves overall performance, and the parity informationprovides data protection. Because of the error-correctioncapabilities, if a drive fails, the data can be quickly andautomatically fixed.In the following graphic, each letter represents a unique blockof data, and the number next to each letter represents whichcopy of the data files are stored on that drive. The “P” next toa letter represents parity (error-checking) information, andeach column represents a separate hard drive.Understanding RAID 10RAID 10 (also called RAID 1+0 or RAID 1&0) contains sets ofRAID 1 mirrors acting as drives within a RAID 0 striping array.With this setup, the array could survive one drive failure in eachmirrored array.A1B1CPA2BPC1APB2C2RAID 5
