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Question about slow USB 2 transfer speeds.

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Boggin:
"up to 90Mb/s" doesn't guarantee any minimum speed.

This article gives tables for different types of files being copied - https://www.cmd-ltd.com/advice-centre/usb-chargers-and-power-modules/usb-and-power-module-product-help/data-transfer-rate/

I only use an USB flash drive when I want to keep a Docs folder up to date and copy it onto another machine and it's only a small file.

I use SanDisk Cruzer Edge USBs.

So is the 17.5 speed while in the USB 3.0 port ?

mrwoof:
USB 2 write speed of 17.5 Mbs. Good article, however I'm not looking for the theoretical max of 90 Mb/s but 8 Mb/s warrants further investigation!  "Micro-SD memory cards, on the other hand, are each designated a speed class according to their minimum write speed". In my case UHS Class 10-= 30 MBps
thanks for your time.

Boggin:
I'm not sure what else to suggest.

Can you go Start - type %temp% and press enter when it comes up.

This is your Temp folder cache and when it get overly populated can have an adverse affect on performance, although I don't know if it would affect USB transfer speeds.

If it is overly populated, press CTRL a to highlight then CTRL d to delete to see if that makes any difference.

Boggin:
I've downloaded and saved a Win 10 ISO which is approx. 4.141GB in size.

I then copied this onto a NTFS formatted 16GB USB.

The transfer rate was very erratic, ranging from 2. something to just over 9 with a brief 11. something.

Because it was so erratic it was impossible to nail down a speed, so given my max speed, yours may be normal.

While my laptop has the max 8GB DDR3 RAM installed, it's only a cheapish Toshiba with an Intel Celeron B800 1.5 GHz CPU with integral graphics.

Higher spec machines may have varying transfer speeds but I can only go by what this one is producing.

EDIT - on checking, it is an USB 3.0 in an USB 2.0 port.

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