I really think you are going to struggle to get the A80 from within SA.
You might also want to look at
ADATA's rugged range. I think Esquire and Frontosa are distributors.
Here's one.
I like to read user reviews, so as to make an informed decision upon buying.
Newegg and
Amazon are useful in this regard. It seems quite a few people have issues regarding the ADATA HD710's cable connection.
A different way to go would be to get a rugged case for your external.
I once asked a sales manager at Frontosa why they didn't do the
WD Nomad rugged case.
Whether by coincidence or through me asking, a month or two later, they had them. They should still sell them - Pinnacle Africa as well.
It fits Western Digital Passport drives. I have a 1TB and a 2TB. The 2TB is a bit thicker, but the case still manages to close - only just! I once tried a friend's cheaper WD Elements 1TB and it also fit (not as thick), even though WD doesn't mention its product code as being compatible with it. I once saw them in a Dion Wired store -
apparently they still sell them.
I can vouch for the WD Nomad + Passport. I once accidentally dropped mine while opening a door - it worked perfectly fine after being dropped from a door handle height.
Just to note: any hdd will be prone to fail taking a knock while powered on.