Re: confused, seems to be my normal state
On Wednesday 18 September 2019 11:36:41 John Hasler wrote:
> Jonas writes:
> > Please demonstrate just one single example of dd being faster than
> > cp to transfer a full raw image to a raw device!
>
> On modern systems you would probably need to be doing terabyte
> transfers between disks on the same machine. Back in the days when a
> megabyte was a lot dd was *much* faster.
>
> On an SD card I think that the write speed of the card is probably the
> limiting factor.
It is, and the makers lie a lot, taking advantage of the buffering to get
thier 100 MBs rating for small writes. For gigabyte transfers I often
see sub 20 MB/S toward the end. But you may want to steer clear of the
64GB+ cards, exfat is creeping into the sdhc arena, and I either have a
defective NEW PNY 64GB, or this stretch install can't touch it because
its exfat. I bought 2 recently, same exact part number, slightly
different card gfx, the 85 meg rated one doesn't mention exfat, works,
the 100 MB/S rated one mentions exfat and is untouchable.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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