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Confusion between 512 byte sectors and 4096 byte sectors? The multiple is 8 between the two.
Almost certainly. It's a 4K logical sector size disk, but the /sysfs block interface always reports size in 512-byte sectors. I bet the Ubuntu guys didn't bother to look this up and are blindly multiplying by the logical block size.
Where is this documented?
It isn't, unfortunately. But a Google search reveals several people coming to that conclusion with code evidence (and a documentation patch that fell through the cracks), so whoever wrote the code didn't look it up, even if the official docs don't have it.
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