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From the above picture you can see the difference of speeds of different technologies. On a general note it can be said that SCSI is faster than SATA with SATA II at 320 Mbps and normal SCSI operating at 320 Mbps.

Robustness

SCSI is a much robust interface. Almost every manufacturer provides longer warranty on SCSI. SATA drives are not less reliable either. But you should remember that a disk drive has a low failure rate because of increased quality of its head, platters and supporting manufacturing process, not because of certain interfaces.

Connectors

As SCSI has been around longer than IDE, there are more types of connectors and controllers available which can work together with appropriate adapters. There are only limited controllers available for SATA

Manufacturing Cost

SCSI costs much more than SATA or PATA. SATA connections are the cheapest to build.

Interfacing

SCSI interface can be used with control scanners, floppy drives, CD changers and tape drives other than interfacing the hard drives. SATA drives are primarily designed for transferring data between computer and mass storage device such as a hard disk and optical drives.

CPU Utilization

SCSI drives don’t use CPU power to run and leaves more CPU time for the rest of the system. SATA use processor to transfer data.

Compatibility

SCSI drives needs some knowledge to setup and SATA drives also has some problems. IDE drives are most compatible of all.

Hot Swapping

Serial SCSI offers hot swapping like SATA. PATA does not allow hot swapping.

Application

SCSI is mainly optimized for server and SATA are made for desktop applications. But now-a-days SATA drives are finding their way to the servers as they provide a cheaper option. For serious performance seekers 15k RPM SCSI drives are the best though a bit on the expensive side.

Conclusion

Thanks for reading this much long. From the above discussion, I think you have understood that SCSI are best suited for server application and SATA for desktops but SATA drives are becoming mature and perhaps will be a powerful alternative to SCSI

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