USB file copy very slow

Hi everyone, I hope that someone can help me with thisproblem:
I was copying some files of 370 MB to a 4GB Kingston USB key and It took around 45 or 50 minutes to copy it and when I try to eject the key it give me an error. I tried again and it was the same; So I remove it without unmounting...... The result, only two of all files were in the usb key.
I'm using LXDE, 2.6.30-arch on a AMD 5200 x2 64bits, 4 GB of ram.
Why it took me too long to copy those files and the error when i was rejecting the USB key???
Thanks to all, please forgive my english....

brebs wrote:
R00KIE wrote:usb flash drives have an activity led for a reason
It would not be reliable, without the flush option, to prevent excessive caching.
Yes you are right, but if lots of data is cached and you ask to unmount the drive from a DE (my experience is with xfce) then I believe there is a timeout before it spits an error about not being able to unmount while it is still trying to flush out all the data (maybe the error the OP received?), thats when the activity led is useful, to check if it is just being stubborn or actually still doing something.
I have noticed that even after xfce says it is safe to remove the device there is still activity for a couple of seconds so I guess one risks to have data loss if removing the drive while there is still activity.
The OP just said 370 MB of data and didn't mention how many files there were, from my experience you get around 5MB/s of writing speed with most usb flash drives (USB2 drives, the most common and cheaper) but this is when writing big files, try to write 300MB of small files and you will quit before it reaches 20% (if you don't count caching).
I have also noticed that even if the kernel does cache the writes it will keep writing in the background, but when unmounting there is always some writing to do so I guess either way it will not be safe to just remove the drive without unmounting first, that flush mount option may be worth looking at ...
Without more details we are all just giving our best guesses, maybe it can even be broken hardware that is causing the problem for all we know.

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