Is it possible that iMac corrupts connected external hdd-s drive via USB?

Is it possible that iMac corrupts connected external hdd-s drive via USB? (two wd cav. green 2tb from different purchase went down in one day, both from the backside usb ports)
First one of my video storage hdd, full of files suddenly got extremely slow, and a few minutes later, it unmounted itself, but with the unmount error, but nobody even touched the cables, electricity etc. When I tried to mount it again, it did not respond, just give a periodical load light and ticking. First I thought it must be hardware failure, but since I bought a brand new drive today and it made the same problem as soon as I tried to format it. I got suspicious. The consol, said about these - i googled all but now solution so far. (WesternFresh is my drive)
Oct 23 17:10:58 xxxx fseventsd[47]: disk logger: failed to open output file /Volumes/WesternFresh/.fseventsd/636573acca1d6550 (No such file or directory). mount point /Volumes/WesternFresh/.fseventsd
Oct 24 10:55:42 xxxx com.apple.kextd[10]: Can't create kext cache under / - owner not root.
Oct 24 17:23:05 tmdc diskarbitrationd[16]: unable to probe /dev/disk1 (status code 0xFFFFFFFA).
and there was an I/O faliure not but it was on another mac - where i hoped itt will come back to live.
I think - if it is possible - that the OS maybe misunderstand something about these drives, and try to change - maybe permissions - all the time if a usb external connects...? (I am not really into it as you see )
Also about Disk Utility - it does not see any partition on the old hdd, but i shows the name of the product. If I connect the new hdd via the keyboard usb, the disk utility is able to see and format it, but the hdd will be still slow and tikking after it.
Also I tried Disk Warrior (freezd out) and Techtool Pro 6 thanks to some ol'frineds - which also not saw the old hdd, but did nothing useful with the new one.
About cav green: I have 3 of them and no error so far, and got 4 1tb cav green in 2 mybook studio II also without any problem.
Iam a bit scared, and try not to plug in any usb hdd-s now, but I have to continue work, so I need solutions.
I hope if it is not hardware failure, maybe some tricky terminal code will bring back the viability of my old hdd - and I won't have to spend a lot of money to recover data.
strange.
if anybody has a clue?
update 1:
i found this post also:
https://discussions.apple.com/message/15905481#15905481
I also made the mentioned steps - but it is a bit different sice it reproduce itself and I cant use DU.

It turned out that WD is the big bad guy in this game.
According the data rescue company where I asked for an inspection, both of the drives had their reader head loose. And in the one, which was my already-in-use disk its even damaged the platters... xxxxx
So its time to pay bunch of money to recover, and take a walk to wd service to bang on the desk.
Also note - it may be somehow related to intellispeed technology - since macs not really friendly with wd-s built-in solutions.
On the other hand, with WD GP 1Tb there is no problems at all for ages.
thanks guys, thread is closed

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