Laptop's usb 2.0 is not offering good speed?

Dell / Inspiron n4010
November 27, 2011 at 06:05:42
Specs: Windows 7, 2.4 GHz / 3892 MB
I have Dell Inspiron n4010 14r laptop with core i5 processor and 4gb ram. Could not get more than 12mb/s speed with usb. When the laptop was new i could get 35mb/s and even more speed with my usb 2.0. But now i Don't know exactly what is the problem, sometimes it takes 15minutes to transfer 1gb file. Well my laptop is completely virus free and do not have any hardware defect i myself has checked it with dell support centers tests. Please HELP....

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November 27, 2011 at 07:06:53
U are still using USB 2.0. The write speed of thumb drives and sd cards is less than 12mb/s u will only get good reading speed from these devices. U can achieve 35 mb/s from external hard drives but sometimes the speed depends on type of the files.

You know the real meaning of peace only if you have been through the war.

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November 27, 2011 at 11:37:26
"The write speed of thumb drives and sd cards is less..."

Also, the read speed is much slower than the write speed - as little as 1/8 of the write speed.


Secure Digital

Scroll down, see the second larger table, after this:

"This table lists common ratings, the minimum transfer rates, and the corresponding Speed Class (though the comparison is not always exact)."


The max data transfer rating of USB 1.1 is 12 mbits/sec, not mbytes/sec, or 1.5 mbytes/sec (8 bits per byte) according to some sources, or 1.2 mbytes/sec (8 bits per byte plus 2 bits per byte for "overhead") according to other sources.

The max data tranfer rate of USB 2.0 is 480 mbits/sec, or 60 mbytes/sec (8 bits per byte) according to some sources, or 48 mbytes/sec (8 bits per byte plus 2 bits per byte for "overhead") according to other sources.

In the real world, you're likely to NEVER get a higher data transfer rate from a USB 2.0 connection than about 40 mbytes/sec for an external hard drive (connected via USB), or for the fastest flash drives or memory cards.

USB 2.0 requirements...

The mboard must have (a) USB 2.0 controller(s)

The computer's bios Setup must have the USB 2.0 controller support enabled - High Speed - it is enabled by default. ("Full speed" there is USB 1.1 support, only).

The operating system must have built in USB 2.0 (controller and device) support.
Windows Vista and Windows 7 do - XP must have SP1 or later Windows updates installed in it or integrated into it.

The main chipset drivers must have been installed in the operating system.

If you have re-loaded Windows from scratch, the built in support Windows 7 has for USB 2.0 controllers and devices is NOT installed in Windows until AFTER the main chipset drivers have been installed for your mboard.

Click on Computer - in the top bar select System Properties - on the resulting screen select Device Manager on the left.
Under the heading USB controllers, if Windows built in USB 2.0 support has been installed, there will be at least one listing for an Enhanced USB controller or similar in the list.

Other stuff.

People often use external USB hubs, especially with laptops and netbooks.
It's well known that external USB hubs DO NOT work properly with all USB devices. Plug any external hard drive or flash drive or external memory card reader into a USB port directly connected to the mboard for the best possible data transfer rate, e.g. a USB port built into the case on a laptop or netbook.

Older built in memory card readers, and older external memory card readers, have a lower max data transfer rate.

If there is a USB cable between the external device and the computer's USB port, it must support USB 2.0 specs.

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