The Absolute Minimum
Here are the high points of this chapter. Review these just before you take the exam to brush up on the major topics and help you identify what you need to review.
The basic unit of measurement for storage or information management is the byte.
When stored as plain text, one character uses one byte of disk space.
Other file formats require more space than .TXT (plain text) files because they reserve space for formatting and document management information stored as part of the file.
Binary numbering uses two digits, 0 and 1. Binary is also called base 2.
Decimal (base 10) uses digits 09.
Binary (base 2) uses digits 01.
Hexadecimal (base 16) uses digits 09 and AF.
Decimal numbers can be converted to binary or hexadecimal numbers through a process of division.
Decimal values such as kilo, mega, and giga are based on multiples of 1,000.
Binary values such as kibi, mebi, and gibi are based on multiples of 1,024.
Parallel transfers use eight wires or multiples of eight wires for data.
Serial transfers use a single wire (or pair or wires) for data.
Parallel transfers are faster than serial transfers performed at the same speed.
Fast serial interfaces such as USB, IEEE-1394, and Serial ATA are as fast or faster than parallel interfaces and will eventually replace most parallel-based interfaces.