User Guide

User’s Guide 297
Understanding iDAT Technology
The entries in the Incremental Resolver table, meanwhile, translate the
sequential numbers from the Multiple Patch Table into actual filenames
that the AutoUpdate utility can download.
The DELTA.INI file also has checksum and other information that the
AutoUpdate utility can use to verify that files it downloaded have not
changed or become corrupted.
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NOTE: If an iDAT download fails for any reason, the AutoUpdate
utility will download and install a full .DAT update.
After it downloads the correct .UPD file, the AutoUpdate utility decodes the
existing .DAT files, patches the downloaded iDAT files into them, validates
the data, then re-encodes the newly updated .DAT files for use with your
software.
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NOTE: Because the iDAT files patch the existing .DAT files you may not
download the iDAT files through the AutoUpdate utility and use the
utility to save them for later updates. You can download the .UPD
packages independently from the McAfee VirusScan FTP site, however,
and save these files for later distribution. See “Best practices” below for
details.
What does McAfee VirusScan Software post each week?
Each week McAfee VirusScan Software posts a complete .DAT file update,
along with a new weekly iDAT update, and a new DELTA.INI file that has
updated Multiple Patch Table and Incremental Resolver entries. You can
download these files independently of the AutoUpdate utility for posting on
your internal servers from the McAfee VirusScan FTP site at:
ftp://ftp.nai.com/licensed/antivirus/datfiles/4.x/
Ë IMPORTANT: To connect to this site you must have a licensed customer
user name and password. The FTP site will not accept anonymous
connections.
A typical file listing would be:
00_index.txt
40534054.UPD
40544055.UPD