A means of transferring data as a continuous block to or from a particular input / output ( I / O ) device on either the multiplexer or selector channel. All channel controls are monopolized for the duration of data transfer.

• 在多路传送器或选择通道上,对特定输入输出设备连续传送数据块的一种方式，在数据传送期间,所有通道控制是独占的。