#1 2017-02-16 14:23:35

vcrini

Member

Registered: 2016-11-18

Posts: 9

external usb 3 hard disk really slow

Hi bunsenlabs lovers,
I've bought a Toshiba HDTB310EK3AA Canvio Basic HDD 1 TB USB 3.0 and attached to my Latitude 3350 to the usb 3 plug.

According to rsync is really slow:

rsync -avviu ~/VirtualBox\ VMs/centos6 /media/vcrini/14ba4f63-3b48-4867-81b5-3be23b6c7a25
.
...copying many files
.

sent 3,672,415,521 bytes  received 228 bytes  97,931,086.64 bytes/sec
total size is 3,671,518,610  speedup is 1.00

because 97,931,086.64 bytes/sec =~ 93 Mbit (97,931,086.64 / (2^20)) it should be around 5000 Mbit
this slower than a usb 2 interface (480Mbit).

I'm not able to understand reason, please could you help me?

This is lsusb output

lsusb -t
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    |__ Port 2: Dev 10, If 0, Class=Mass Storage, Driver=usb-storage, 5000M <== here is hd
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/11p, 480M
    |__ Port 4: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
    |__ Port 4: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
        |__ Port 3: Dev 3, If 12, Class=Communications, Driver=cdc_mbim, 480M
        |__ Port 3: Dev 3, If 13, Class=CDC Data, Driver=cdc_mbim, 480M
        |__ Port 6: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
        |__ Port 6: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M

and 'uname -a' is telling me

Linux criniv 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1 (2016-12-30) x86_64 GNU/Linux

vcrini

Member

Registered: 2016-11-18

Posts: 9

Re: external usb 3 hard disk really slow

No, my fault.
I read instead of bytes, bits. And so my conversion is wrong.
Number is not 93 but 93x8 that an accettable one (since my hard disk is 5400 rpm).
Sorry for the noise.