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This tip is part of SearchSecurity.com's Data Protection School lesson, E-discovery and security in the enterprise. Visit the E-discovery and security in the enterprise lesson page for additional learning resources. Most information security pros have a handle on the major data types found in their environments, but they also know that there is a whole lot more data lurking around the edges. These unknown data types can include documents used by individuals, or whole applications owned by departments that have quietly become essential to the business. Most of the time, focusing on the squeaky wheels is an acceptable strategy; if there's no "squeak" then there's no need to worry. But when it comes to litigation, and especially managing the electronic discovery process, what you don't know can hurt you. There are four major types of data in use today: paper documents; structured data sets, like databases; semi-structured applications, like email and image stores; and unstructured repositories, like file servers. Comprehending the vast volume of these varied records can be a challenge for everyone involved, which includes information technology, records management, legal staff, and even the data owners themselves. But since almost all business information is stored in digital formats today, electronic storage systems are the most popular target for the discovery motions filed as part of legal proceedings. It is most efficient for a litigator to head straight for your email, spreadsheets and applications, looking for what they term electronically stored information (ESI). Making matters worse for IT administrators, new rules for civil litigation enacted at the end of 2006 (called the Federal Rules of Civil Procedure, or FRCP) have pushed up the timetable of electronic discovery. What was once a delayed and informal process has become much more structured, with lawyers meeting to discuss available ESI, typically just a few weeks after legal action commences. When l