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Re:Western Digital unveiled its SanDisk 1TB SDXC card prototype by Amezarak on Wednesday September 21, 2016 @08:18AM (#12547467)
On the other hand, I've never gotten writable optical media to last longer than three years, despite storing them in a cool dark closet.

Did you compare checksums on the data you wrote?

Re:Western Digital unveiled its SanDisk 1TB SDXC card prototype by codezero on Wednesday September 21, 2016 @10:55AM (#12548704)
On the earliest data, nope! Very likely I had some or many flipped bits.

I did have the backups on multiple discs and comparing the two they had the same data so I guess that's almost as good.