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File Control Block (FCB)

A Microsoft Disk Operating System (MS-DOS) data structure that stores information about an open file. The number of FCBs is configured in CONFIG.SYS with a command “FCBS=x,y” where x (between 1 and 255 inclusive, default 4) specifies the number of file control blocks to allocate and therefore the number of files that MS-DOS can have open at one time.