[time-nuts] Re: Clock display on Linux systems?

[Adrian Godwin]

SD cards used in dashcams also suffer severe rewriting behaviour. I believe
there are reviews and comparisons covering various makes in this
application.

On Wed, Dec 8, 2021 at 9:30 PM Kevin Rowett <kevin at rowett.org> wrote:

> The sandisk extreme sd cards have an excellent wear leveling algorithm.
>
> KR
>
>
> > On Dec 8, 2021, at 1:26 PM, Nick Sayer via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > I forget where I saw it, but my understanding is that the big issue is
> finding SD cards that can perform whole-disk wear leveling, like proper
> SSDs do. Apparently, the WD purple series do, according to the e-mail
> thread I read that I forgot where. Someone contacted WD and got a
> confirmation that these really do have whole-disk wear leveling. Given that
> they’re targeting surveillance cameras, it seems reasonable.
> >
> >> On Dec 7, 2021, at 6:09 AM, John Sloan <jsloan at diag.com> wrote:
> >>
> >>> In this application RPis seem to last for many years - in others where
> we
> >>> use the SD-card (e.g. influxdb or similar) they seem to regularly fail
> in
> >>> 1-2 years, requiring an reformat or new SD-card. An RPi or similar
> with a
> >>> more robust SSD/M2 drive would be good.
> >>
> >> I’ve had the same experience with the SD cards.
> >>
> >> At least the most recent Raspberry Pis (e.g. the 4B) support firmware
> to boot from USB with just a little configuration effort. I just recently
> starting playing with this, booting a RPi 4B from a USB-attached Samsung T5
> SSD. It seems to work mostly fine (caveat: see below). For other reasons,
> I’ve been running a RPi-specific version of Linux MATE, but Raspbian should
> work okay too. (I tried the RPi-specific image of Ubuntu, since I run
> Ubuntu on my Intel machines, but was not terribly impressed; slow
> interactive response.)
> >>
> >> One thing I did run into: if I try to plug too many USB devices in
> along with the SSD - e.g. in my case a mouse, keyboard, and GPS dongle -
> the system crashes because the SSD USB connection resets. It seems to be a
> power problem; I solved it with an external powered USB hub, leaving the
> SSD on a USB port on the RPi.
> >>
> >> :John
> >>
> >> --
> >> J. L. Sloan             Digital Aggregates Corporation
> >> +1.303.489.5178         3440 Youngfield Street
> >> mailto:jsloan at diag.com  #209
> >> http://www.diag.com     Wheat Ridge CO 80033 USA
> >>
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