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In computer science, group coded recording or group code recording (GCR) refers to several distinct but related encoding methods for representing data on magnetic media. The first, used in 6250 bpi magnetic tape since 1973, is an error-correcting code combined with a run-length limited (RLL) encoding scheme, belonging into the group of modulation codes.

The others are different mainframe hard disk as well as floppy disk encoding methods used in some microcomputers until the late 1980s. GCR is a modified form of a NRZI code, but necessarily with a higher transition density.

Source: Wikipedia

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Battelle Hall (originally known as the Ohio Center) is a 6,864 seat multi-purpose exhibit hall located in Columbus, Ohio, part of the Greater Columbus Convention Center. It opened as the Ohio Center on September 10, 1980, and although sometimes considered a white elephant because of its small size and seating capacity (concert fans usually found themselves driving to Cincinnati Riverfront Coliseum, Indianapolis Market Square Arena, Detroit Joe Louis Arena, Cleveland Richfield Coliseum or Pittsburgh Mellon Arena), it has been used for a variety of events, including concerts (Conway Twitty, Devo, Elvis Costello & The Attractions, The Stray Cats, Rick Springfield, Kiss (2/19/84), Culture Club, Ratt, The Pointer Sisters, Cyndi Lauper, Billy Idol, Billy Ocean, Richard Marx, Queensrÿche), trade shows, and sporting events such as the 1993 and 1994 Mid-American Conference men's basketball tournaments.

The exhibit hall was also the home of professional wrestling cards from the early 1980s to mid-1990s with monthly visits from the WWE and the occasional WCW event. The hall totals 90,000 square feet (8,400 m2) of exhibit space - 65,000 on the main floor and 25,000 on the balcony, and can be divisible into two halls. The first entertainment event at the facility was comedian Rodney Dangerfield and special guest McGuffey Lane on September 20, 1980 attended by 6,677 persons. Battelle Hall was also home to the Columbus Quest from 1996-1998, where the team won both championships in the now-defunct American Basketball League. Former players include Katie Smith, Sonja Tate, Tonya Edwards, Andrea Lloyd, Valerie Still, Shannon Johnson, and Nikki McCray.

Source: Wikipedia