The speed and performance of the data interface can be the performance bottleneck of the recording solution and may determine the maximum devices that the recorder can optimally support. The ATA interface has been originally developed for the internal HDDs of desktop PCs, while Small Computer System Interface (SCSI) has been developed for servers and large scale storage systems.
Due to demand for high speed data transfer, hard disk interfaces are moving from parallel to serial transmission. For instance, Serial Attached SCSI (SAS) will replace Parallel SCSI and Fiber Channel (FC), Serial ATA (SATA) will replace Parallel ATA.