A general-purpose file system for secondary storage

摘要: The need for a versatile on-line secondary storage complex in multiprogramming environment is immense. During interaction, user-owned off-line detachable media such as cards and tape become highly undesirable. On the other hand, if all users are to be able retain much information they wish machine-accessible storage, various needs crucial: Little-used must percolate devices with longer access times, allow ample space on faster more frequently used files. Furthermore, easy when required, it safe from accidents maliciousness, should accessible an easily controllable basis desired. Finally, any consideration which not basic user's ability manipulate this invisible him unless he specifies otherwise.