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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 12:55:29 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Also I'm not counting card writes......and attempting to get the best bang for my buck....

If i were I sure as hell wouldn't be taking this route.....LOL....

On 07/26/2018 12:45 PM, Alan Scott wrote:
Cause its taking a while - 2.19GiB 0:44:52 [ 842KiB/s] 20 mins a gig on 16 gigs im gonna be here a while.....!!!

On 07/26/2018 12:41 PM, Alan Scott wrote:
So would the same go for this Gary....?

dd if=/dev/urandom | pv | sudo dd of=/dev/sdb bs=1M

On 07/26/2018 12:26 PM, Gary E. Miller wrote:
Yo Alan!

On Thu, 26 Jul 2018 12:02:23 -0700
Alan Scott <address@hidden> wrote:

this dd - zeros should eliminate that issue.......
Not a good idea with SD cards.  Each block on the SD card can only be
written to a limited number of times before it is unuseable.

Some SD cards die after just 500 full card writes.

Worse, SD cards have spare blocks and use wear leveling.  So when
you dd zeros you are not over writing the old data, just writing
to spare sectors.

Some cards support "fstrim".  That tells the SD card to mark unused
blocks as empty, without wasting a write cycle.

I find, confirmed by others, that some cards prefer some adapters over
others.  Some suggest never using a USB3 adapter with SD cards.

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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