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Raid Technology
What is a RAID? RAID is an acronym for Redundant Array of Inexpensive Disks. The concept was conceived at the University of California, Berkeley and IBM holds the intellectual patent on RAID level 5. Some of the design goals of the RAID storage system were to provide performance improvements, storage reliability and recovery, and scalability. The redundancy concept employed by RAID systems is unique and provides a method to recover if one drive should fail within the system. In fact, today's RAID controller cards have the ability to continue reading and writing data even if one drive is 'off-line'.

What is a Sector?
"A sector is a section of the track on a drive platter whose size is determined by the type of formatting selected. When used as an address component, sector and location refer to the sequence number of the sector around the track. Typically, one sector stores one record of data. The number of sectors per track is dependent on the system type, the controller capabilities, and the drive encoding method and interface. A bad sector is an area on the platter that has become inaccessible or unable to hold data.