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USB 3.0 at USB 2.0 speeds

Last response: in Components
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January 16, 2014 8:51:48 AM

Hello. I have a Lenovo Ideapad z585 which has 2 usb3 and 2 usb2 ports.

I have a usb3 flash drive and a usb3 external hdd.

My transfer speeds on the hdd max an 30MB/s and the flash maxs at 11MB/s in both the usb2&3 ports.

So my usb 3 ports are only getting usb2 speeds.

I've looked in the bios and the are no usb options, I've checked the lenovo site and there are no driver updates, and windows updates haven't helped.

What can I do to enable the usb 3.0 ports?

More about : usb usb speeds

January 16, 2014 8:56:09 AM

It's likely the ports are fine and the devices you are using aren't capable of using the extra bandwidth that USB 3 provides.
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January 16, 2014 9:05:18 AM

ish416 said:
It's likely the ports are fine and the devices you are using aren't capable of using the extra bandwidth that USB 3 provides.


I'd have expected even a slight increase in speed. Is there anything I can use (software) to see if my usb3 ports are on?
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January 16, 2014 9:23:19 AM

You need a USB 3 device that is capable of speeds higher than 30MB/s. If the blue USB ports work at all, the devices you are plugging into them aren't capable of the faster speeds offered by USB 3.

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January 16, 2014 9:30:33 AM

Just because a flash drive advertises USB 3.0 doesn't mean it's speed will hit the high end of 3.0.

Try looking at the advertised speed of the individual devices. Just like hard drives, SSDs, or graphic cards - not all are created equal.
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January 16, 2014 9:45:00 AM

Adroid said:
Just because a flash drive advertises USB 3.0 doesn't mean it's speed will hit the high end of 3.0.

Try looking at the advertised speed of the individual devices. Just like hard drives, SSDs, or graphic cards - not all are created equal.


I don't want the high end, I just want faster than usb2.0.
i'd have to assume that an internal ssd and an external 15'000rpm hdd connected to usb3 would be faster than the usb 2 ports.
All cables are usb3 too.
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January 16, 2014 10:27:27 AM

If you were to install an SSD into a USB 2.0 or a low end USB 3.0 enclosure, even though the SSD is capable of much faster speeds, the enclosure itself could only communicate at USB 2.0 speeds (30MB/s) or slight faster.

For example, I have a Transcend USB 3.0 flash drive, it does 30MB/s reads and 15MB/s writes. I have another Sandisk USB 3.0 flash drive that does about 230MB/s reads and 200MB/s writes.

It all depends on what the device is capable of. Just because it says USB 3.0, don't expect speeds much faster than USB 2.0 unless it shows a read/write speed above 30MB/s.
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January 16, 2014 1:27:57 PM

ish416 said:
If you were to install an SSD into a USB 2.0 or a low end USB 3.0 enclosure, even though the SSD is capable of much faster speeds, the enclosure itself could only communicate at USB 2.0 speeds (30MB/s) or slight faster.

For example, I have a Transcend USB 3.0 flash drive, it does 30MB/s reads and 15MB/s writes. I have another Sandisk USB 3.0 flash drive that does about 230MB/s reads and 200MB/s writes.

It all depends on what the device is capable of. Just because it says USB 3.0, don't expect speeds much faster than USB 2.0 unless it shows a read/write speed above 30MB/s.


This is what I was trying to say. Look at the rated speed on the Flash Drive you are talking about. If it says 30MB/S - there is your answer there. Having a USB 3.0 or Sata 6GB/S won't speed up a Flash Drive rated at 30MB/S....
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