Before him, Bill Clinton took a total of 174 days for himself. Another big vacationer was Ronald Reagan, who took a total of 390 days during his time in office. In comparison, Obama has only taken 161 vacation days to date.
HDDs are the most commonly used storage in personal computers, servers and enterprise storage systems, but are rapidly giving way to faster solid-state drives (SSDs). Optical data storage is popular in consumer products, such as computer games and movies, and is also used in high-capacity data archiving systems.
Essentially, it is the part of the computer that stores your information. If you upload a picture to your computer, it is stored on the hard drive. Hard drive capacity is measure in megabytes, or MB, though some massive computer store in terrabytes, or TB.