A type of data transfer mode often used in SCSI devices. In Blind Data Transfer mode, the CPU allows the SCSI chip to oversee transfers, freeing the CPU for other tasks. The CPU checks in only once before a block of data is transferred, requiring constant timing of the computer, rather than a polling method where the CPU would have to check for a Request/Acknowledge handshake with every byte transferred. The polling method requires more CPU time, so blind transfers complete much faster. However they do not work well in some situations with certain types of hardware.