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2M is a DOS program by the Spanish programmer Ciriaco García de Celis. It enables higher than normal capacity formatting of floppy disks. It saw active development from 1993 to 1995. The last version, v3.0, was released on 6 March 1995. It was written in C and assembler and compiled using Borland C++ 3.1.

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  • 2M (DOS) (en)
  • 2M (es)
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  • 2M is a DOS program by the Spanish programmer Ciriaco García de Celis. It enables higher than normal capacity formatting of floppy disks. It saw active development from 1993 to 1995. The last version, v3.0, was released on 6 March 1995. It was written in C and assembler and compiled using Borland C++ 3.1. (en)
  • 2M es un programa para el sistema operativo MS-DOS (o su variante IBM PC DOS) creado por el programador español . Permite una capacidad mayor que la norma de formateo de disquetes. Fue desarrollado de forma activa entre 1993 y 1995. La última versión, la 3.0, fue lanzada el 6 de marzo de 1995. El programa fue creado en lenguaje Ensamblador, con algunos programas auxiliares hechos en C, y se compiló usando la versión 3.1 de Borland C++. (es)
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  • 2M is a DOS program by the Spanish programmer Ciriaco García de Celis. It enables higher than normal capacity formatting of floppy disks. It saw active development from 1993 to 1995. The last version, v3.0, was released on 6 March 1995. It was written in C and assembler and compiled using Borland C++ 3.1. The program consisted of two major components: 2M and 2MGUI (from "2M Guinness"). Of these, 2M was the main program enabling the formatting, reading and writing of high density 3.5" disks formatted to a capacity of either 1804 KiB or 1886 KB, and 2MGUI was a proof-of-concept program that demonstrated the ability to format any normal high density 3.5" disk to a capacity of over two million bytes (1972 KiB) on any disk drive. Both programs implemented disk I/O speedups in the form of "Sector Sliding" and "DiskBoost", which work on the principle of ordering the physical sectors on the disk to facilitate pauseless reading over track changes. 2MGUI utilized bit banging and tricked the floppy controller into writing a full track of data as a single sector before resetting the floppy controller in order to avoid overwriting the next track, enabling the absolute maximum capacity possible at the physical level. A similar technique was also used by Vincent Joguin's Disk2FDI for Amiga floppies. (en)
  • 2M es un programa para el sistema operativo MS-DOS (o su variante IBM PC DOS) creado por el programador español . Permite una capacidad mayor que la norma de formateo de disquetes. Fue desarrollado de forma activa entre 1993 y 1995. La última versión, la 3.0, fue lanzada el 6 de marzo de 1995. El programa fue creado en lenguaje Ensamblador, con algunos programas auxiliares hechos en C, y se compiló usando la versión 3.1 de Borland C++. El programa cuenta con 2 componentes principales: 2M y 2MGUI. De ellas, 2M es el programa principal y el que posibilitaba el formateo, y la lectura y escritura de discos de 3.5" de alta densidad de o 1.804 KiB o bien 1.886 KiB, mientras que el 2MGUI (abreviatura de 2M-Guinness) es una "prueba de concepto", para demostrar la capacidad de formatear cualquier disco normal de alta densidad de 3.5" a uno con una capacidad de más de 2 megabytes (1.972 KiB). Ambos programas se basaban en aceleradores de entrada/salida de disco a partir de las técnicas de Sector Sliding y DiskBoost, que se basan en el principio de ordenamiento de los sectores físicos en el disco, para facilitar la lectura al cambiar de pista. (es)
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