On 2008-12-31 10:49:56 PM, Xavier Lamien wrote: > Could you perform an hdparm -tT on that disk ? /dev/sde: Timing cached reads: 2668 MB in 2.00 seconds = 1336.06 MB/sec Timing buffered disk reads: 1024 MB in 3.01 seconds = 340.69 MB/sec > Also, output an strace against your cat & dd commands. > > if my memory is good enough, cat use mmap() which is faster than > read() (which is used by dd) I just straced dd and cat, and it looks like cat is using a block size of 4096 bytes while dd is using 512 bytes. I *think* they were both just using read(). Perhaps dd if=/dev/sde of=/dev/null bs=4096 would be a better command to compare against. Thanks, Ricky
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