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Isnt the standard preservation system tape drives? They tested the longevity of different storage solutions ages ago to avoid stuff like this.
Not really. Disk is king now since S3 storage took the crown when cloud services started offering cheap archiving. Anything still on disk from the 90s is some neglected archive that has been deemed by the company to have no value.
I would assume they're finding this out now because they're trying to feed their whole archive to the AI beast.
S3 archive is on glacier which is all tape
How do I get Glacier instant retrieval from a tape?
No one really knows, and Amazon won't say. There's speculation it's tape, low-rpm drives connected to custom logic boards, Blu ray, etc.
It's almost certainly tape, a single LTO9 cartridge can hold 18TBs of data for cheap compared to the equivalent drive.
Blu-ray is unlikely, only quad layer BR have a decent capacity at 125GB each and quality ones are hard to find these days. Sony has even stopped making their blu ray based Optical Disk Archival system thing.
It's almost certainly spare space from massive S3 disk pools that's unused.