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Sound similar to the issue reported at the below link. I suggest adding a comment in that post with your DVD drive eject issue.
Update: I just tested this and can confirm inserting a CD or DVD into an optical drive will cause LR 7.3.1 to hang (Not Responding) on my Windows 7 system. I'll add this information at the below post and you can add any additional comments.
We are happy to announce the release of Lightroom Classic CC 7.4
This issue has been fixed in this update. Lightroom Classic 7.3: Unresponsive after Eject SD Card/USB Drive | Photoshop Family Customer Community
Here's a list of what's new in this release: New features summary for the October 2017 and later releases of Lightroom Classic CC
Let us know if the update resolves the problem for those affected and share your feedback with us.
Thank you Mohit. It appears to have corrected the issue on my Windows 7 system.
Great, thanks for the feedback.