Mbé vs Perm

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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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Perm (Russian: Пермь, IPA: [pʲɛrmʲ]), previously known as Yagoshikha (Ягошиха) (1723–1781), and Molotov (Мо́лотов) (1940–1957), is the largest city and the administrative centre of Perm Krai, Russia. The city is located on the banks of the Kama River, near the Ural Mountains, covering an area of 799.68 square kilometres (308.76 square miles), with a population of over 1 million residents. Perm is the fourteenth-largest city in Russia, and the fifth-largest city in the Volga Federal District. In 1723, a copper-smelting works was founded at the village of Yagoshikha. In 1781 the settlement of Yagoshikha became the town of Perm. Perm's position on the navigable Kama River, leading to the Volga, and on the Siberian Route, across the Ural Mountains helped it become an important trade and manufacturing centre. It also lay along the Trans-Siberian Railway.

Perm grew considerably as industrialization proceeded in the Urals during the Soviet period, and was named Molotov in honour of Vyacheslav Molotov. After the dissolution of the Soviet Union, the city returned to its historical name, and became the administrative centre of Perm Krai. Modern Perm is still a major railway hub and one of the chief industrial centres of the Urals region. The city's diversified metallurgical and engineering industries produce equipment and machine tools for the petroleum and coal industries, as well as agricultural machinery. A major petroleum refinery uses oil transported by pipeline from the West Siberian oilfields, and the city’s large chemical industry makes fertilizers and dyes. The city’s institutions of higher education include the Perm A.M. Gorky State University, founded in 1916.

Source: Wikipedia