A data structure that stores access control information for a file. It is created when a file is accessed on a volume. It is deleted when the file is deaccessed.; 存儲(chǔ)文件的存取控制信息的一種數(shù)據(jù)結(jié)構(gòu)。當(dāng)卷上的文件被訪問時(shí)即建立該文件的WCB，不 訪問時(shí)WCB即被刪除。