What is an incremental VDF update (IVDF)?
The Avira AntiVir PersonalEdition Premium supports the so-called “incremental update” of the virus definition file. Incremental VDF updates (IVDF update) work as follows: daily updates of the VDF file are not downloaded in the form of one large VDF file but as small VDF files (name: antivir3.vdf) that are only a few kilobytes in size and which only contain virus patterns that have been newly added. This daily VDF file supplements the weekly VDF (Name: antivir2.vdf), the monthly VDF (Name: antivir1.vdf) and the so-called Basic VDF (Name: antivir0.vdf), which are already installed with every Avira AntiVir PersonalEdition Premium program package as standard. If one of the so-called VDF files reaches a determined size its content is transferred to the next higher VDF file, which has to be downloaded additionally. An advantage of the incremental VDF process is that the download volume is extremely small. This leads to extremely short download times and costs, also if the download is perform
