Perná vs Mbé

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Perná is a village and municipality (obec) in Břeclav District in the South Moravian Region of the Czech Republic. The municipality covers an area of 9.33 square kilometres (3.60 sq mi), and has a population of 764 (as at 28 August 2006).

Perná lies approximately 22 kilometres (14 mi) north-west of Břeclav, 39 km (24 mi) south of Brno, and 210 km (130 mi) south-east of Prague.

Source: Wikipedia

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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