Types of Hard Drivers
SATA: Commodity SATA drivers
Cheapest in Capacity, but medium in IOPS ( I/O Operations Per Second). Reliability of commodity SATA is their biggest issue.
SAS: Enterprise SAS drivers
SAS drives are usually only used in servers. They’re more expensive because they have better error correction and can come in speeds of up to 15,000 RPM, 2x-3x that of most SATA drives (4500-7200 RPM). More pricy than SATA driver in Capacity. 2 times more expensive than SATA driver in IOPS.
SSD: Solid State Drivers
Far too expensive in capacity, but much more cheaper than SATA and SAS in IOPS.