Mbé vs Stara Zagora

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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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Stara Zagora (Bulgarian: Стара Загора, pronounced [ˈstarɐ zɐˈɡɔrɐ]) is the sixth-largest city in Bulgaria, and the administrative capital of the homonymous Stara Zagora Province located in the historical region of Thrace.

Source: Wikipedia