1. Fluctuations of aggregate economic activity. 2.Cycles Expansion/Boom and Contraction/Recession. Peak and Trough: They are the turning Points of the business cycle. 3. Comovements of many macro variables over the business cycle.
Section 5: Using external media: CDs, DVDs and removable USB storage devices. â¢ dvd-r:until about 2005 the most common and portable format; cannot be erased or reused. â¢ dvd-rw:are-writable version of-rformat, similar to cdrw format CD discs.
Introduction to Computer Information Systems/Storage - CDs, DVDs, and BDs. 1  Read-only optical discs include CD-ROM, DVD-ROM, and BD-ROM discs. 2  Recordable optical discs are also sometimes referred to as write-once discs. 3  Rewritable optical discs include CD-RW, DVD-RW, DVD+RW, and BD-RE discs.