Mint 13, 64 bit, KDE USB speed problem

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Mint 13, 64 bit, KDE USB speed problem

Postby zolar1 on Fri Aug 09, 2013 1:00 pm

I checked in the kinfo thing and it reported that I have USB 3.0 speed of 5,000 MB/s.

When copying or moving data to a USB 3.0 flash drive (I have 2 different ones to test with), I only get USB 2.0 (480Mb/s) speeds.

How can I get the rated speed? That slow down is a factor of 10. And quire significant.
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Re: Mint 13, 64 bit, KDE USB speed problem

Postby zolar1 on Fri Aug 16, 2013 2:58 pm

Actually I get 50Mb/s or less speeds. Not even a true usb 2.0 speed.

Pretty awful when you have a usb 3.0 port and a usb 3.0 flash drive.
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Re: Mint 13, 64 bit, KDE USB speed problem

Postby Snapcase on Sat Aug 17, 2013 1:49 am

One thing is the theorical speed an USB port (or whatever port) protocol can give and a quite different thing is what actual speed a device can give. Many flash drives and mechanical drives cannot reach those max transfer speeds. True bottlenecks. It often happens if you don't thoroughly check the specs when buying devices. They can use a given protocol, let's say USB 3 or SATA... but doesn't imply that they're able (designed or optimized) to use the full available bandwidth. Some flash drives or hard drives are faster/slower than others. Just check the specs.

A typical example. Theorically, USB 2.0 is faster than Firewire 400. But in the real life, most USB 2.0 devices give much slower transfers than most Firewire 400 devices. Normally devices implemented with FW400 are intended for high data transfer usages (Soundcards, etc...). While USB 2.0... well, just for plain data transfer in so many cases. Far from optimized and intended to be as fast as the protocol allows. The transfer speed is set by the slowest link of the chain (Device-cable-HUB). If a hard disk is slow itself, It doesn't matter how fast the transfer protocol can be.
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Re: Mint 13, 64 bit, KDE USB speed problem

Postby zolar1 on Sat Aug 31, 2013 3:25 pm

I ran across some suggested tweaks to increase USB speeds.

1) set it for ASYNC
2) Format and use a 128K block size.

I have no idea how to do these but those were claimed to significanty increase USB speeds.

Any thoughts?
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Re: Mint 13, 64 bit, KDE USB speed problem

Postby Snapcase on Mon Sep 02, 2013 1:03 am

Here's a guide. Haven't tried it myself.

And to go deeper into the dd command.

http://www.softpanorama.org/Tools/dd.shtml
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Re: Mint 13, 64 bit, KDE USB speed problem

Postby zacharysonicfast on Mon Sep 02, 2013 3:05 pm

I saw those. Thanks.

I was wondering if there was a way to permanently set it for async for every device attached via usb.

Note: I had to use windows to R/R some flash drives for exFat with 128K block size fur dual use.

Now I should be able to get a 'little' more write speed....
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