Comparison of USB- and Firewire-interface This possibility is mainly used by external hard disks or memory sticks. By the expansion to eSATA-Bus (External Serial ATA Bus) it is also possible to connect some external devices to the PC through the SATA-interface. Serial ATA, also called SATA is actually a data bus in the PC that communicates the processor with the hard disk or other drives. It is also noticeable that USB and IEEE 1394 are having a "neck-and-neck race" concerning the data transfer speed, despite of the fact that long time ago USB outperformed Firewire in popularity. One recognizes immediately that the obsolete serial and parallel interfaces cannot be considered anymore for the tramsmission of large data amounts the way it is usual today. In the table above, the maximum transmission speed and the maximum cable length for numerous interfaces and variants of interfaces are compared. This is why most of the modern slide scanners are delivered either with an USB- or a Firewire-interface. This is why only USB, Firewire and SCSI can be considered, whereby there are increasingly less models with a SCSI-connection, as for SCSI, a separated SCSI-controller is needed that has to be specially installed into the computer and that is not really cheap. The obsolete serial and parallel interfaces are long ago not sufficient anymore for slide scanners. As in case of a scan of a high resolution, the modern film scanners partly have to transmit several hundred megabytes to the computer, a high data transfer volume of the interface is needed in order not to unnecessarily enlarge the scanning times. How is a film scanner connected to a computer? As known, computers offer a lot of different interfaces that mainly differ on the data transmission time and the length of the cable.
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