SCSI ("scuzzy") is based on an older interface developed by floppy disk drive manufacturer Shugart ... and typically connect via an external port on a storage controller card using a cable.

There were a few cheap SCSI host adapters for the PC, like the Seagate ST01 and ST02, but they weren’t good performers. Fast interfaces were pretty expensive. The other hard drive connectors ...

which emulates a SCSI hard drive using a microSD card for storage. [David]’s pulled that off, maxing out the NCR5380’s throughput with plenty to spare on the SD card end of things. Future work ...

Each channel (SAS port) transfers data at 3, 6 or 12 Gbps in each direction. In contrast, the consumer-oriented SATA interface has only one channel. The Serial SCSI Protocol (SSP) is used for SAS ...

In the 1990s, an external drive was often a SCSI disk or tape, because the SCSI interface offered more peripheral expandability at that time (see SCSI). Contrast with internal drive. THIS ...