短語詞組短語alternate offset track 交替偏移磁道alternate e track 交替磁道alternate track table [計]備用磁道表alternate track assignment program 替代軌道指定程序alternate track table operation [計]交替磁道表操作alternate track rebuild program 替代軌道重建程序alternate track area 替代軌道區(qū) 返回 alternate track