External Hard Drive Failures after iMac internal drive replaced

I was one of those lucky ppl who had to have my internal 1TB Seagate HDD replaced due to the recall. It was replaced on Friday.
After the drive was replaced (with another Seagate, ***?), I cloned my previous system back to the new drive (restoring from Time Machine required me to re-download Lion, which required me to re-download to a newer version of Snow Leopard, and just, Oi, vey, I used my clone).
I then had to create another bootcamp partition, and after that, I restored my previous bootcamp from an image backup with Winclone.
The next morning, my Time Machine external backup drive (a Maxtor OneTouch) makes horrible fluttering and crunching noises and cannot be found via disk utility, certainly doesn't mount to the desktop. I figure it just coincidentally failed and attached a new drive (a different OneTouch) for backup.
While Time Machine is performing an initial backup to this new drive (will take 10 hrs), I try to move a few media files to another external media drive (LaCie 1TB). I receive a couple of error -36s on a few particular files, so I figure I should wait for the Time Machine to backup and then diagnose the media drive.
The next morning (after 10 hr backup is finished), I have a stop-sign error that a disk was unmounted improperly (the LaCie media drive). The drive cannot be seen in disk utility or on a completely different MBP running Snow Leopard. It's spinning up, but it can't be read.
Only thing I can think to do is reinstall 10.8.2 over top the cloned system, make sure that the recovery partition was recreated and working.
This can't be a coinicidence, right? At this point, I'm afraid to keep my external storage drives and clone attached to the iMac, but I'm afraid to not have TM drive attached. Anyone know where to start diagnosing the problem?
1. Could a new internal drive be the problem, hardware wise?
2. Could the lack of an initial recovery partition or the setting up of a bootcamp partition have these sorts of consequences?
3. Could the problem be from restoring a clone?

Well, it is a LaCie-packaged adapter, some version of that model. The hub is on the mac mini inspired line of LaCie HDs (http://www.lacie.com/company/news/news.htm?id=10269). I've had it for 6 yrs, and the hub is still going. Other drives have been running from the hub without issue for all that time (and still are). There is no hissing, and the display light indicates the hub is getting power.
You think it's time for a new hub?
The internal switchout is just a coincidence?
(Basically, I'm not a hardware expert. Does anyone know if an internal drive or internal sensor/connection problem can cause externals to fail or blowout a controller? I'm waiting on a drive dock to arrive—I'll know more whether these are HD failures or chip failures after that. Both drives showed normal-seeming power use via their display lights.)

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