Hi Aspire, serial scsi is the technology that replaced the old parallel scsi standard that we are all used to. Most commonly serial scsi is used in server’s serial attached scsi drives, also known as SAS drives. These hard drives are very common in brand new servers. Serial scsi is a standard for data transfer just like parallel scsi was. It is considered the norm now and the standard is getting faster and faster. You can read a bit about it at this link.