[SOLVED] Why is USB 3.0 so slow?

[Myronazz]

I bought a USB 3.0 drive today and for some reason, its running at 2.0 speeds (30 MB/S). I have had 3.0 drives before and they never went anywhere near the advertised speeds (600 MB/s). I thought maybe its because they were from weird brands like Intenso, but this one is a Sandisk, so why? I have a B350-Plus MB so support is no problem.

I decided to do some investigating, and it seems like it is running on USB 3.0 mode:

Anyone have any ideas?

 

[Nemesia]

What are you trying to do with your USB 3.0 Drive? If you're moving files to what kind of drive are you moving the files to?

The speed will always be limited by the slowest thing in the chain.

If your USB 3.0 drive is plugged in a 3.0 USB port it should be using the advertised speed but only if you transfer the files to itself or to a drive that can achieve that speed too.

Transferring files from that USB 3.0 drive at 600MB/s to a 100MB/s HDD the speed will be 100MB/s. Not 600MB/s.

 

[Myronazz]

Oh yes, I understand that. I am tranferring through a PCIe M.2 SSD that can do a lot more than 600 MB/s. In fact, transferring from the SSD to the slowest HDD in the system goes at a speed of about 100 MB/s but the USB 3.0 gets 35 MB/s

Honestly I am used to these speeds since I have never in my life seen a USB 3.0 drive go fast, but I thought I'd find out why.

 

[popatim]

Just because the external drive has a USB3 interface doesn't mean its a fast drive.
You can stick a cd drive in a USB3 enclosure and it won't make a single bit faster. Slow is slow.

You need to research before you buy to see what speed the drive is capable of. Basically speed costs, the faster you want to go, the more it costs. 100MB/s flashdrives cost a lot more then the ones that only do 10.