Jerky video playback

[Volker Wysk]

Am Mittwoch, dem 14.06.2023 um 15:42 +0200 schrieb Ralf Mardorf via ubuntu-
users:
> On Wed, 2023-06-14 at 15:01 +0200, Volker Wysk wrote:
> > There's another strange thing, which might or might not be related. I have
> > two external hard disks, which I use for backups. Both have USB 3. When I
> > synchronize the two, I get a data transfer rate which fluctuates between
> > about 20 MB/s and 150 MB/s. That's what's displayed by the "rsync" command.
> > I expect that this display is smoothed.
> 
> Hi,
> 
> from hearsay it's what I would expect from shingled magnetic recording
> (SMR) drives, see picture: 
> https://www.researchgate.net/figure/Real-time-bandwidth-of-SMR-vs-CMR-disks-when-performing-random-writes_fig1_339923370
> For visually impaired subscribers a description of the real-time
> bandwidth of SMR vs. CMR disks when performing random writes. For CMR
> drives it's more or less a flat line, while for SMR drives read:
> https://www.musixmatch.com/lyrics/Vengaboys/Up-Down

That last link points to some music lyrics... You've posted the wrong link,
have you?

I get the idea, what this shingled magnetic recording is (see Wikipedia).
But I DON'T have many random writes. Most data is in a dozen or so of very
large dar archives.

If it IS because of that SMR, then it's a weakness of the technology, not a
(hardware) error, right?

Thanks and bye,
Volker
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