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Posted · Original PosterOP

Hello, I was wondering why is that my new USB device is somewhat slow compared to other USB 3.0 devices.

The first file I transfered to the usb was a 2gb video and the average file transfer was a CONSTANT (110 MB/s) which I deleted afterwards.

After the first video file now all files behave in like a wave like transfer speed that I will show in an image.


My pc specs are the following-

Gigabyte GA-Z97-SLI
I7 4790k

Samsung SSD 850 Evo

Using motherboard USB 3.0 Connections on the backplate

Funny to add that in 1 of the 4 USB 3.0 connectors the speeds are a little bit faster
at about 160 MB/s Write and 65 MB/s Read
compared to the other 3 ports at 149 MB/s Write and 46~54 MB/s Read

using Crystal Disk Mark 6 default settings 4 benchmarks each port

The usb device is this one
64GB ADATA UV150 3.2 (which is basically 3.0)

-Is this normal? 

usb waves.PNG


EDIT: Forgot to add my SSD.

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Yeah that's normal, it's going to slow down/speed up depending on what type and what size of file it's copying.

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Posted · Original PosterOP
2 minutes ago, Electronics Wizardy said:

Looks like a cache that is getting filled up. Probably filling the ram cache or a slc cache on the drive. pretty normal for a usb stick.


2 minutes ago, Zando Bob said:

Yeah that's normal, it's going to slow down/speed up depending on what type and what size of file it's copying.

Oh.. I actually didnt know it was like that because the very first file an .mp4 had no slowdown/speedup and i was convinced all .mp4 files would behave like the first one but I was wrong.


Thanks for the replies.

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