DA difference deep scan and fast scan

Which criterions are base of deep scan and fast scan ?
Yesterday I start with deep scan to “Microsoft Project Forum” at 04.03.2009 18:47.
Today at 05.04.2009 09:36 DA is still searching.
DA found 1938 documents.
I stop DA now


Both are default search sets but can be customized, see Tools > Edit Search Sets…

The Deep Scan uses several plugins and follows links up to 5 levels, the Fast Scan uses only one plugin and doesn’t follow links.