âHouse Price Index. The HPI is a broad measure of the movement of single-family house prices. The HPI is a weighted, repeat-sales index, meaning that it measures average price changes in repeat sales or refinancings on the same properties. This information is obtained by reviewing repeat mortgage transactions on single-family properties whose mortgages have been purchased or securitized by Fannie Mae or Freddie Mac since January 1975.
The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive for secondary storage. The system was publicly announced on September 14, 1956, with test units already installed at the U.S. Navy and at private corporations. RAMAC stood for Random Access Method of Accounting and Control, as its design was motivated by the need for real-time accounting in business.
Typically random access memory (RAM) is the primary storage device and the slower rotating magnetic media (disc drive) is the secondary storage device. Other devices like USB â¦thumb drives and other removable media are considered tertiary (3rd level) storage devices. 6 people found this useful.