Question about slow USB 2 transfer speeds.

[mrwoof]

Question about USB 2 transfer speeds. Device i3/4Gb   W7.
Copying a video file (720p Mp4 -935Mb ) from the laptop to a Micro SD card via adapter to a USB 2 port.
Speed settled at 8 MB/second. Speed seems slow for USB 2 .
Have attached  image with SD spec. Why is it so slow?

[Boggin]

There are some tips in this article for speeding up USB transfer speed - https://www.easeus.com/resource/fix-slow-usb-transfer-speed.html

[mrwoof]

What speeds should I expect ?

[Boggin]

I think it's up to 35MB for USB 2 - have you tried formatting the USB to NTFS as the article suggests ?

I did come across an article which suggested going into Device Manager - expanding USB Controllers - right clicking on an USB Root HUB and selecting Properties/Advanced would give the data rate, but on both my Win 7 and Win 10 machines, that just said it was working at full or high speed.

If your port is defective then that may report something else.

However, there is a Reset Hub button under Advanced which may improve things.

You may need to do that for each Hub so that you do it for the Hub that is being used,

[mrwoof]

Hi Boggin
I read the article you referred to.
Conversion made little difference / reset hub & update likewise. Tried different ports, nada.
Then using a USB 3 port, write value rose to 12 Mbs compared to 8+ on V 2.
 Attch USB 2 write speed of 17.5 Mbs.
Have tried various speed tests, however they all give different values when I re run them!
Will submit my data to support at "Platinet"as packaging state "up to 90Mb/s, a Polish outfit.
Question, does the nature of the data, (eg .mp4 .doc etc) affect transfer speed?

[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.