Good to know, I see others also have relatively better speed with USB3 pins in USB2 ports, and also with USB2 sticks in USB3 ports, compared to USB2 sticks in USB2 ports. One is often tempted by low price offers - usually for old USB2 sticks - and forget to take such things as speed into consideration.peterw wrote:It shows that even on a USB 2 port the USB 3 sticks perform well
USB Flash Drive Quality
BarryK, thank you for caring, but the mistake was on me. I broke Linux rule no.1, I was careless on the keyboard!
True freedom is a live Puppy on a multisession CD/DVD.
USB Flash Drive Quality
I ran the test on a 16gb Lexar usb 3.0 flash drive that is plugged into a usb-2.0
port:
# sync
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/zero of=/mnt/sdh1/dummyfile bs=1M count=1024 conv=fdatasync oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 49.2252 s, 21.8 MB/s
#
It's one of those plastic jobs that has good speed but it's kind of
fragile.
******************************************************************************
Here's the same drive plugged into a usb-3.0 port:
# sync
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/zero of=/mnt/sdh1/dummyfile bs=1M count=1024 conv=fdatasync oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 43.0959 s, 24.9 MB/s
#
port:
# sync
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/zero of=/mnt/sdh1/dummyfile bs=1M count=1024 conv=fdatasync oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 49.2252 s, 21.8 MB/s
#
It's one of those plastic jobs that has good speed but it's kind of
fragile.
******************************************************************************
Here's the same drive plugged into a usb-3.0 port:
# sync
# echo 3 > /proc/sys/vm/drop_caches
# dd if=/dev/zero of=/mnt/sdh1/dummyfile bs=1M count=1024 conv=fdatasync oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 43.0959 s, 24.9 MB/s
#