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

From: Alan Scott
Subject: Re: [gpsd-users] Fwd: Re: 1PPS not working with RPi 3 B+ and Stretch
Date: Thu, 26 Jul 2018 14:43:51 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

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 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.

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

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