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Advantages of combining multiple DVDs into one Blu-ray disc：

Space saving: Since Blu-ray discs can store more data than DVDs, combining many DVDs onto a single Blu-ray disc can significantly reduce the number of actual discs and storage space. can.

High quality: Blu-ray can store higher resolution video and audio than DVD. Therefore, you can combine multiple DVDs into Blu-ray to get a higher quality viewing experience when playing.

Ease of use: Combine multiple DVDs onto a single Blu-ray disc to avoid the hassle of switching DVDs over and over again.

Long Lifespan: Blu-ray discs have a longer data lifespan than DVDs. Therefore, it is possible to store a lot of data at once and access it for a long time.

Data protection: Blu-ray discs have powerful error correction features. This reduces the possibility of data loss even if the disk gets scratched.

For more information: https://dvdfab.org/tips/copy-dvds-to-blu-ray.htm