McAfee AVDCDE-BA-CA User Guide - Page 320
How does iDAT updating work
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Understanding iDAT Technology How does iDAT updating work? The AutoUpdate utility downloads two types of files when it connects to the update site you specified: • .UPD files. These update files contain only the virus definition changes between one weekly .DAT file release and the .DAT file release from the week immediately following. The names for these .UPD files consist of the version number of a .DAT file release-4053, for example-and the version number of the very next .DAT release in the sequence, or 4054 in this case. The complete filename for this .UPD file would therefore be 40534054.UPD. If you updated your .DAT files every week, the AutoUpdate utility would simply download the weekly file, then install it alone to bring your .DAT files up to date. If you have not updated your software for three or four weeks, however, the AutoUpdate utility would need to download a number of .UPD packages from which it could extract and install all of the virus definition files it needed to bring your existing .DAT files up to date. The utility finds the information it needs to determine which packages to download in the DELTA.INI file. • DELTA.INI files. These are text files that describe which weekly .UPD files the AutoUpdate utility needs to bring your .DAT files completely up to date. The DELTA.INI file consists of entries that list a number of previous .DAT file versions, along with the corresponding number of weekly .UPD files it would need to download from a given .DAT file version number in order to have all of the virus definitions that the current .DAT file release has. The file entries have the following format: [Multiple Patch Table] 4053=10 4054=11 4055=12 [Incremental Resolver] 10=40534054.UPD 11=40544055.UPD 12=40554056.UPD For this example, suppose you have .DAT version 4053 installed on your computer and the current .DAT file release is version 4056. The AutoUpdate utility can look in the DELTA.INI file to learn that it needs to download the 10th, 11th, and 12th .UPD file releases to have all of the virus definitions that the current .DAT file release does. 320 McAfee VirusScan Anti-Virus Software