True cost economics is an economic model that includes the cost of negative externalities associated with goods and services. Definition: True cost economics is an economic model that includes the cost of negative externalities associated with goods and services.
By contrast, a 750GB SATA drive can be had for about $130, which means that you can have about 2TB of usable conventional hard disk spinning storage, or about 60 times as much space as the SSD, protected against a single disk failure in a RAID-5, for the same price as the 32GB SSD.
SATA is a interface for storage devices intended to be used within the PC box itself or in a external box with USB. USB is a general purpose I/O interface for external equipment to the PC. It is often used for external disk drives as well as cameras, keyboards, mice, etc. eSATA is a SATA interface with external connectors on the PC designed for talking to external disk drives outside the case.