I have about 7 devices (speakers, mouse, etc.) that are all USB. They all came with CD's containing drivers for it. My question is, why do they? All 7 of these devices have run just fine on every computer I've ever owned (XP, Vista, Ubuntu, 7) without me even bothering with installing the included drivers disk. All the functionality works. My first thought was that it was just downloading it off the internet but even land-locked computers (i.e. no internet) were able to successfully utilize the devices without me installing.
Can somebody explain to me the purpose then for these devices to include the drivers disk?