USB Removable Media copying VERY SLOW
Hi all, I am using Ubuntu on a Latitude notebook and just noticed that copying a 23mb zip archive to the USB removable media that detects and browses fine is very slow - ie under windows when I have copied this sort of size the copy finishes much faster.
Any ideas why this would be - is there a mode or option that sets the data transfer rate. I have downloaded some 20 images off a digital camera, zipped them up and copied them to the USB to send to another member of the organisation.
In the past I would spend half my day in Windows doing Lotus Notes/MS-Office and Digital Camera stuff and now that I have Lotus running under WINE and OpenOffice is so good I am basically 99% free of Windows at work - this is great
Anyway I just thought that someone might know why this transfer might be so slow...
BTW it is a USB v1 usb hub - though I don't know all the stats on it - or the exact capacity of the stick.
It sounds like the usb 1.0 hub is causing the problem.
If you type
lspci -v what do you get pertaining to the USB hub?
Also do lsmod and see whether there is a module for ohci or ehci, or something like that - can't remember the exact name.
Sounds like it's running at usb2 in wondoze and 1.1 in linux..........
Another cause could be supermount. I've seen much slower data rate with supermount enabled, than with manual mount/umount.
lspci -v yields:
usbcore 104292 3 uhci_hcd
I do not know how to check for supermount.
here is syslog
I see what you are saying. It appears that the system things your USB hub is rather slower than it should really be....
I have a similar problem in that my front USB hub is running at 1.1 speed but it actually works at 2.0 speed in windoze....
here's my lspic -v:
However,as I said the front one works as usb 2 in MS.
I belive this if 20 [EHCI]) indicates that it's usb 2.0
Not sure which USB hub is which yet though.
I am thinking to recompile my kernel with only support for ehci. I compiled it myself, so it's likely I made an error. Before I did that i remember it ran pretty fast. Did you compile yours?
I found this:
It looks like you only have a 1.1 hub. So i guess you need UHCI support........
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