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You're right, a copy of the OS on DVD/CD should be mandatory on all new laptops.
I bought an IBM laptop a few years ago and it didn't have any installation media. Instead, it has a separate partition that contains the OS images which you install from. While this does work, you end up installing a very old version of the OS and then have to jump through all the hoops to get up to the latest version.
It's an older model so the CD media is no longer available from IBM.
As I wanted to install Linux, I had to replace the hard disk so I could still run/install Windows in an emergency.
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