Usb3 drive disconnecting all the time at a usb 3 port on my macbook pro

i just bought the new macbook pro 13 inch and i was into some point tricked because the salesman from apple assured me that the laptop would be shipped with mountain lion and i could do the upgrade for free for maverick. so when i recieved the computer i found out that it actually came with maverick intalled and after talking to an apple customer support he said i could not go back to mountain lion. so most of my software are damaged according to the new system and it simply doesnt let me open many apps i just installed.
so now i have another bigger problem. everythime i connect a usb 3 HD into my new macbook, the HD gets disconnected. i used already 3 diferent drives and tried at least 3 diferent cables but the problem persists. Note that it never happenned with a usb2 port. is anyone having the same problem?
at this point i am pretty upset with the company alltogether. i had purchased at least 30 macs and i never had any sort of problems till now.

I just got a new IMAC and experienced the same issue with a RAID 10 array with 4 drives spontaneously disconnecting in the middle of a data transfer with the message "you should eject disk properly, etc. etc." message.
As many others I tried all the obvious solutions. Different cables, different drives, etc. Then I read something about radio wave interference from wireless keyboards. Well, I don't have wireless keyboards or mice (don't like them) but still, it stuck in the back of my mind.
I did find that a USB 2.0 cable with noise suppression dongles at each end worked just fine, if a bit slowly. Anyway, I found an old set of ferrite couplings that were made for video cables back in the day and placed one set at each end of the USB 3 cable. I then moved my RAID array as far from the computer as possible and plugged it all back in. The problem has not reoccurred even with the transfer of very large folders of files from a networked PC RAID.
Just a thought but it seems to have worked for me although the fact that this sort of thing is necessary does not speak well for Apple.

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