BSAM is used both for devices that are naturally sequential, such as punched card readers, punches and line printers, and for data on devices that could also be addressed directly, such as magnetic disks.
BSAM is used both for devices such as punched card readers and for data on devices such as magnetic disks. These devices could also be addressed directly. Punched card readers are punches and line printers. These devices are naturally sequential.