Xbox 360 can still read og Xnox doscs as well as 360 discs but my Xbox One cant read...

The disc drive is most likely broken. Contact Microsoft so they can repair it.

If you are having troubles detecting and reading the disc, I would strongly recommend having a look at the link below:

Troubleshoot issues playing disc games on Xbox | Xbox Support

Hi,

It's not the discs it's your console. If your console can not read DVD movies then it won't read Xbox 360 games either. DVD movie discs use the same type of discs that 360 games use (DVD-9).

The Xbox One has two lasers to read discs. One for Blu-rays - which Xbox One discs games are made of - and one for reading DVD's and Xbox 360 games.

if your xbox cant read any discs, go to
support.xbox.com/.../disc-drive-solution

if it still not reading, you need to send it for repair.

May I point some things out.

Xbox one games on disc are stored on Blu-ray discs. Only the Xbox 360 and the original Xbox use the 'DVD' format.

What difference does this make?

All Blu-ray drives can read DVD discs as well as BD discs, but the laser diode to read DVD discs work at a different frequency to Blu-ray. As I understand it, these diodes are contained in the same package in the drive.

If a hardware fault occurs with the drive, it may manifest with ability to still read BD discs but not DVD, or the other way round.

If your console can't Xbox 360 games, but can read Xbox One games, it usually means the drive is faulty.