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(Not a) Quality Product
on 17 March 2013
EDITED - SEE BELOW
March 2013 : I have a number of LaCie external drives (previous generation D2 Quadra, 2 x 2Big RAID) and have always been impressed by the performance and build quality. I will always pay more for a quality product, especially to avoid plastic enclosures. Reliability has never been a problem and the only slight quibbles have been that one of the 2Big units has a relatively noisy fan, and all units make an electronic 'whoop' noise as the drives spin-up.
This new D2 Quadra unit is virtually silent - starting-up, reading & writing, and shutting down - a big improvement. Unlike some of the other reviewers I have not had any problems with interfaces not working - USB, FireWire, and eSata all work fine (eSata via my QNAP NAS).
This new drive is almost perfect except for one thing - the blue LED strobes brightly when the unit is reading or writing (far more than the subtle flicker on my other LaCie units), and it really catches my eye. I'm not aware that the LED can be deactivated.
Overall, definitely recommended.
EDIT June 2015 :
After a little more than two years of light use (it's been used as a Time Machine backup disk for my Mac, so total runtime will have been modest) the unit has suddenly died. Won't stay mounted, won't transfer data, permissions can't be repaired (Mac Disk Utility software) without reformatting the disk (which would erase all the data). I've had several LaCie drives and none have failed yet - I'm not happy that this 'premium' unit has had such a short lifespan.
Recommendation now has to be be "avoid".