Thats what the drive tells it
> 1) the drive says buffer size equal 0 and Linux kernel reports it
> 2) the drive says correctly some buffer size different from 0 and Linux
> kernel
> doesn't understand and shows and use 0.
>
> Why are you completely sure that 2) in such cases is false?
It is case 1. The drive is allowed to report 0 and have more than 0 cache.
Quite why it would do this I dont know. You won't find any drive from a
recent era with 0 cache. Your salesman is telling at least part of the truth
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