Mac Mini ethernet read / write speeds different

Hello.
I have a 2.3 GHz Intel Core i5 Mac Mini running OS X Version 10.8.4.
I recently bought a Synology ds212j NAS, and started to transfer some files across my home LAN.
Everything was running fine until I noticed that the transfer had started to go really slowly.
At first I thought it was the NAS, but after exhaustive testing I think the problem is with the Mac Mini ethernet port.
I ran the LAN Speed Test program against the NAS and got the following results (with the NAS plugged directly into the Mac Mini):
Writing (Upload): 54 Mbps
Reading (Download): 689 Mbps
I get similar results when running against my time capsule:
Writing (Upload): 44 Mbps
Reading (Download): 767 Mbps
Can anyone explain what might be going on? Is it a defective ethernet port? Are there any steps I can take to further diagnose / resolve the issue?
Thanks,
Scott

Thanks for replying Johnathan.
I understand that write / read speeds can be different on a hard disk, but the key thing here is that the speeds changed suddenly - I was getting similar write / read speeds and then something changed (I don't have speed statistics for that).
One other thing to note is that if I plug in an external drive via USB I get write / read speeds the same.
This all makes me think that something has changed with the Ethernet port. Either it is malfunctioning or there is a cache issue etc. The problem is that I don't know how to do further diagnosis, or how to resolve.
Scott

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