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Raw data is a term for unprocessed data, it is also known as primary data. It is a relative term (see data). Raw data can be input to a computer program or used in manual analysis procedures such as gathering statistics from a survey. It can refer to the binary data on electronic storage devices such as hard disk drives (also referred to as low-level data).

In computing it may have the following attributes: possibly containing errors, not validated; in several different (colloquial) formats; uncoded or unformatted; and suspect, requiring confirmation or citation. For example, a data input sheet might contain dates as raw data in many forms: "31st January 1999", "31/01/1999", "31/1/99", "31 Jan", or "today". Once captured, this raw data may be processed and stored as a single format, perhaps a Julian date, so as to be easier for computers and humans to interpret during later processing.

On electronic storage devices it is represented as binary numbers and is stored as sectors typically of 512 bytes. When interpreted as a file system by the disk operating system, it becomes a collection of files and their metadata.


http://en.wikipedia.org/wiki/Primary_data



In research, Secondary data is collected and possibly processed by people other than the researcher in question. Common sources of secondary data for social science include censuses, large surveys, and organizational records. In sociology primary data is data you have collected yourself and secondary data is data you have gathered from primary sources to create new research. In terms of historical research, these two terms have different meanings. A primary source is a book or set of archival records. A secondary source is a summary of a book or set of records