The term has quite a different used in datacommunications: Modern file transfer protocols send data in blocks, or packets, rather than just a byte at a time. Usually, the larger the block size the more efficient the file transfer. This is because most file transfer protocols wait for an acknowledgement from the other end after each block is sent, so larger blocks mean fewer stops for handshaking. However having blocks too big slows things down. This is because a single error means the whole block must be re-transmitted. Not only do the blocks take longer to retransmit, there is an increased change for error in each block.
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