Local disc copy at 10MB/s! What could be the problem?

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http://unix.stackexchange.com – I am running a Debian 6.0.6 (before you ask). I have a regular desktop computer, nothing fancy... but when I copy a file using nautilus I am getting 10MB/s copy speed and the system is completely stuck! I did some reading and executed hdparm -tT /dev/sda with the following output: /dev/sda: Timing cached reads: 2428 MB in 2.00 seconds = 1214.07 MB/sec Timing buffered disk reads: 274 MB in 3.01 seconds = 91.05 MB/sec So in theory my dist is a lot faster, but in reality it is working very slow. Any ideas what could be the problem? or at least how to search for clues? (HowTos)