Re: [gpsd-users] Fwd: Re: 1PPS not working with RPi 3 B+ and Stretch

[Alan Scott]

I'm currently 2H 45M into this random data crap of a write and am 
worried about the effects of yanking the card out now, as bad as what I 
am doing is not sure if yanking the card is gonna be an asset or a 
determent....at this point......50/50....?


On 07/26/2018 01:04 PM, Gary E. Miller wrote:
> Yo Alan!
>
> On Thu, 26 Jul 2018 12:41:28 -0700
> Alan Scott <address@hidden> wrote:
>
> > So would the same go for this Gary....?
> >
> > dd if=/dev/urandom | pv | sudo dd of=/dev/sdb bs=1M
> Much worse.
>
> Some SD cards and SSD's detect all zeros and just do a trim.  Writing
> random data will force a write, and wear out your card.
>
> If you want worn out SD cards, I have a large pile to share.
>
> I have no idea what pv is, what is does, or why in the pipe.  If you
> want to watch progress, just add "status=progress" to the dd.
>
> "sudo" is evil.
>
> Alsmost all SD cards and SSD prefer bs=4M.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         address@hidden  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>      "If you can’t measure it, you can’t improve it." - Lord Kelvin