Josh Berkus <> writes:
>> So what's going on with the empirically derived value of 4? 

> It's not empirically derived;

Yes it is.  I ran experiments back in the late 90s to derive it.
Check the archives.

Disks have gotten noticeably bigger since then, but I don't think
the ratio of seek time to rotation rate has changed much.

                        regards, tom lane

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