-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Friday, 2016-11-04 at 11:41 +0100, Carlos E. R. wrote:
On 2016-11-04 07:45, jdd wrote:
Le 04/11/2016 à 01:41, Anton Aylward a écrit :
Right now I am using my USB3 SDXC adapter in q USB2 socket and seeing a fantastic speed improvement over one 'fee' one I got with one of those 32G-that-was-really-only-8g chips.
my guess is that you have usb1 speed, for whatever reason.
usb3 is very fast, as fast as sata and may be more
Yes, the card reader was usb 1, same as mine was. The current one is a real usb2. And 3, but works in usb2 mode.
You could measure the read speed and compare with the theoretical speed.
I'm measuring mine: Telcontar:~ # hdparm -tT /dev/sdg1 /dev/sdg1: Timing cached reads: 12582 MB in 2.00 seconds = 6298.27 MB/sec Timing buffered disk reads: 110 MB in 3.03 seconds = 36.31 MB/sec Telcontar:~ # Now I try to copy to hard disk some photos. cer@Telcontar:~/borrame> time cp /media/A766-EDEC/DCIM/100D3200/* . real 1m45.295s user 0m0.031s sys 0m5.868s cer@Telcontar:~/borrame> cer@Telcontar:~/borrame> du -cbs 3979020540 . 3979020540 total cer@Telcontar:~/borrame> which means 36.03MiB/s, same speed as hdparm said. The nominal speed of USB2 is 480 Mbit/s, so it is within limits. The card reader, USB3 class, is working at USB2 speed (it is connected via USB2 plugs). - -- Cheers, Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEARECAAYFAlgejDwACgkQtTMYHG2NR9UtKgCeJb7+OyTv9nQidxBnSJElSuR7 NGIAn1m+hV/7d2EOXvnpKYcKe/zufgvZ =VHCx -----END PGP SIGNATURE-----