[sigio]

1TB would be nice, but never heard of these, and the quoted wikipedia page lists:

Like HD DVD, CBHD discs have a capacity of 15 GB single-layer and 30GB dual-layer and can utilize existing DVD production lines.

So sounds relatively equivalent to bluray, which is way to small to backup modern HDD's (10TB+)

[lyu07282]

it's actually 128GB per disk (BDXL), I only know of Chinese companies announcements of 500GB optical disks last year[1], not sure if they are already deployed to some enterprise partners, it's entirely possible. Their more theoretical research goes far beyond that. [2]

There are archival storage machines similar to tape drive robots for archival storage in the Chinese market where you have hundreds of such disks in a single unit and 1PB+ per rack.

[1] https://mp.weixin.qq.com/s/dU8QdK8w8f5qziWP0UYQuw [2] https://www.theregister.com/2024/02/23/optical_disc_breakthr...