This is a strange problem. I had a problem with my hard disk and using mandriva linux live cd. I downloaded a file and i wantto store it on a pendrive but when i try to copy it the transfer speed shows 4KBs per sec. This is f**king slow what do I do. I need this file. Please help me.

On some computers, one of the USB ports will be faster than the others, especially for audio devices. One is on another hub maybe shared with a USB 1.0 device. It is also possible that that is the speed of the download due to the server.

Can you try copying a file from your system to the pendrive to test the write speed?

You might also try running the "sync" command to empty the cache before starting the download. It may be waiting on previous items to be written first. The updating of the directory structure can take a long time for flash based devices.

What are the mount options that were used? Here is an example for comparison:
/dev/sdb1 on /media/UDISK type vfat (rw,nosuid,nodev,noatime,flush,uid=1000,utf8,shortname=lower)

You can ignore the uid=1000. That is my UID.