Slow USB 3.0 Under Debian Linux


Slow USB 3.0 under Debian Linux.

Purchased an new USB3.0 external case for my computers USB3.0 port, putting in an OCZ 120GB SSD and was expecting alot of speed, compared to USB 2.0 transfer speed.

After all USB2.0 is supposed to be able to transfer 480MBps and the latter USB3.0 up to 4.8Gbps.

Slow USB 3.0 under Debian Linux.

USB 3.0 is the third major version of USB (Universal Serial Bus) to interface computers and electronic devices.

Its connectors and cables are usually different from the previous versions of the USB. This one is the much developed version of USB.

This is how you test the transfer speed for USB3.0 in Linux.

First type the following command:


Press Enter,

Result: PCI-Express) (rev 01) 05:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)

Next, we need to know if the USB3.0 driver is working.

Type the following command:

lsmod |grep xhc

Pressing Enter, gives this result:

xhci_pci  16384  0

xhci_hcd         266240  1 xhci_pci

usbcore          290816  8 xhci_hcd,ehci_pci,usbhid,usb_storage,uvcvideo,

So far so good, it is working ok.

Next we need to find out the transfer speed of your UBS3.0 to the external SSD drive.

Type the following command, whether it is a black USB2.0 port or a blue USB3.0 port:

sudo hdparm -t /dev/sdb

Press Enter,

Result for blue: Timing buffered disk reads: 538 MB in  3.00 seconds = 179.14 MB/sec

Which is a pretty ok result, seeing that the SSD is highly encrypted.

Still need to test with an unencrypted USB3.0 Pendrive.

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