I see that too. If I give someone a part drawing in PDF format, I get much better results than if it's a DXF. The dimensional accuracy of the finished parts is usually ±0.006, versus ±0.012 with DXF. But that really only comes through if I use v1.7 PDFs. v1.5 is more common, but the text has a much warmer quality, almost like it was back when PDFs were encoded using tubes. That will always lead to lower accuracy.
Likewise, RAR files give much better compression when I put them on thumbdrives, versus on a network server. Obviously that's because the computer knows that a thumbdrive is only a small thing with one or two flash chips in it, whereas a network server is a whole large enclosure with multiple hard drives in it, so bigger files can fit in there.
And don't even get me started on the subject of rotation direction of hard drive platters. To get top-notch performance, you have to make sure you're working with the Coriolis Effect.
You might think that SSDs are immune to this, but once electrons are into their little charge-storage cells in Flash, they can start to swirl around. For better performance, tilt them upright. That helps get all the electrons out of the charge traps when a file gets erased.
This naturally all makes sense because of math.
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