There is yet another thing. The device has to be present during windows setup or it will not get installed, and when you plug it in at a later date, you will need the CD.

Unless, of course, you use KTD, the purpose of which is exactly that, to make a driver disc for later added devices no longer needed.

The question, however, is whether the much longer (for me at least) Finisher time of KTD enabled is actually worth it for one single device.
In my case, I could surf to the manufacturer's website, search, download extract and install the driver (I never really like using the setup.EXEs for that...) much quicker than it takes for KTD to finish.
Granted, you can limit it to certain DriverPacks or HW tags (when I used it it was on for all), but it's probabaly not worth the hassle.

YMMV, of course.

Anyway, the CD has the full package, and we could not do that for all.
There is yet another thing. The device has to be present during windows setup or it will not get installed, and when you plug it in at a later date, you will need the CD.

It is possible we do not have it.
We will need the HWID.
We will also need link to the driver.