Data corruption while reading from disk

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https://bbs.archlinux.org – HiRecently I had problems copying big files on my system and then I noticed a strange behaviour.I booted an Arch Live CD (so it should be a clean system), mounted any of my hard drives and then I did the following:dd if=/dev/urandom of=bigfile bs=1M count=2048 echo 3 > /proc/sys/vm/drop_caches md5sum bigfile echo 3 > /proc/sys/vm/drop_caches md5sum bigfileAnd I got two different checksums!I tried it on different hard drives so I guess it is not a hard drive failure.It happens only when processing big files (> 1GB).I ran Memtest86 and it said everything is ok.Now I think it could be so (HowTos)