What are the “update” CDs?
Update CDs are CDs which contain all the packages that changed between the rev0 and a later revN release of the current stable distribution. For example, if you already have the full set of 3.0rev0 CDs, you can use the “update-3.0rev2” CD to turn this 3.0rev0 set into a 3.0rev2 set. This type of CD is intended for vendors having large amounts of pressed rev0 CDs (which makes them cheaper than individually burned CDs). If you order CDs from such a vendor, it is possible that you receive CDs for a slightly older revision, plus an update CD for the latest revision. This is a perfectly acceptable way of distributing Debian on CD. Of course, this type of CD can also be useful to you as an end user; instead of creating the full set of CDs for each new revision of a release, you only need to download and burn one or two update CDs for your architecture. You only need to download either the update CD or the normal CDs, not both! Now, what if for some reason you do not want to download the upda
