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SD card slows down to 0.5mb/s on USB 3.0

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  • USB3
Last response: in Storage
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September 22, 2014 2:26:24 PM

USB 3.0 and 2.0 same speeds on MSI Z97 U3 Plus.

I re-installed latest USB 3.0 drivers for motherboard but both still fairly slow
averaging 4.5 Megabytes/s to transfer a 528 MB file.

There is an initial burst of speed when transferring the file that reached 30 MB/s and
then it slows down towards the end with the total transfer averaging 4.5 mb/s.


More about : card slows 5mb usb

September 22, 2014 7:13:55 PM

Is the file going from an SSD onto the SD card or from and HDD? Have you tried defragmenting the HDD (if you are using one)? Also, try turning off write caching and disabling Host to buffer flushing. note: you risk a bit of data loss, but a buggy cache might be the problem. What OS are you running?
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September 22, 2014 7:36:26 PM

SSD to SD and visa versa, on win-7, home premiun 64 bit as I'm testing my new build.

Everything else is blazing fast but not USB for some reason.
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September 22, 2014 9:29:50 PM

Anyone have any ideas? According to this webiste
http://www.macworld.com/article/2039427/how-fast-is-usb...

I should be getting around 150 Megabytes per second date transfer and I am only getting 4.5 MB/s. with my SSD to SD.

I did some more tests and right clicked all the files in the USB controller in Device Manager and win-7 says all the drivers are up to date.

Speed to transfer my 528MB file to and from the SD is about 120 seconds USB 3.0 or 2.0. on my new build with SSD. My 14 year Toshiba laptop will transfer them in 45 seconds.

Burst speed on my build is about 30 MB/s which lasts about 2/3rds of the way then it crawls to a snails pace.

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September 23, 2014 1:44:42 AM

You won't get 150MBs. The SSD might do that but the SD card won't. Look up its specs.
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September 23, 2014 1:53:41 AM

SD card says 90 MB/s but I'm getting burst of 30 MB/s and then overall average by the time the 500MB folder transfers to SSD of only 4.5 MB/s USB 3.0 or 2.0. Somethings wrong somewhere for sure. Like I said, my 14 year old Toshiba notebook is almost three times as fast on USB 2.0 to transfer that 500 MB folder.

I was reading the mobo user manual and noticed that the front USB is on the intel Z97 express chipset and the rear ones on the ASM1074 chipset so I'm going to see if that makes a difference.
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September 23, 2014 2:40:43 AM

Well, I must be working too long that I can't think straight!

SD to SDD speed is 538 MB/s on all USB 3.0 ports.

SDD to SD card is only 10 MB/s so I will call the card manufactures to see what
is going on. I don't really transfer much to SD only from so no big deal for now,
but I want to get that working too eventually
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September 23, 2014 3:02:03 AM

10MBs is 80Mbs
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September 23, 2014 11:15:53 AM

My SD card says 600x or 90 MB/s so I think they mean Megabytes/s not megabits/s?
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Best solution

September 23, 2014 3:06:54 PM

If SD cards don't work return them or trash them.
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September 23, 2014 6:24:00 PM

This was a 32 gig card and not so cheap so, since I got it from amazon, I can easily send it back which I will do now.
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!