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  Reply # 879518 16-Aug-2013 13:50
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Inphinity:
Regs: disagree completely.  we have USB2 and USB3 flash drives here and the difference is huge.  the USB2 ones max out around 20-25MB/sec whereas the USB3 ones are 100-120MB/s.  the 100MB/s difference is enormous, especially when shifting 50GB database files around


Agree - sort of. I just did a quick test with a Corsair Flash Voyager Slider 16GB (USB3.0). 160MB file copy on then off, to local SATA 6Gbps SSD. USB 2.0 port, then USB 3.0 port.

USB 2.0 - Read 22.1MB/sec Write 15.7MB/sec
Corsair - Read 68.2MB/sec Write 19.6MB/sec

So, clearly the write speed of the flash is a limitation, but for read in particular there is a big improvement. I've got a 64GB version too, it gets slightly higher read speeds but more like 60MB/sec writes.

I have a Sandisk Extreme also, though not with me to test, but I am confident it has done both read & write at about 180MB/sec.



you can put fast flash memory on a USB2 interface and it will only go as fast as USB2 will let it
you can put slow flash memory on a USB3 interface and it will only go as fast as the flash memory will let it

this is why there is also a "Class X" distinction on SD cards, and why there is a price difference between brands.

FWIW, I used this Apacer usb flash drive in my tests above.

"Apacer USB 3.0 64GB AH552 HIGH PERFORMANCE Flash Drive 110MB/s read 70MB/s write under USB3.0, up to 30MB/s read, 20MB/s Write under USB2.0- LIFETIME WARRANTY"




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  Reply # 879522 16-Aug-2013 13:52
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