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. The connector and cable is slightly different from an internal SATA cable. You would use an eSATA if you had an external drive with power and an eSATA connector on it.