file control block


file control block

(operating system)(FCB) An MS-DOS data structure thatstores information about an open file. The number of FCBs isconfigured in CONFIG.SYS with a command

FCBS=x,y

where x (between 1 and 255 inclusive, default 4) specifies thenumber of file control blocks to allocate and therefore thenumber of files that MS-DOS can have open at one time. y (notneeded from DOS 5.0 onward) specifies the number of files tobe closed automatically if all x are in use.