Interesting...
...in that the Barracuda LP drives do exist, are labeled as "LP" variants and can be purchased (at least here in the US). I have a 2TB Barracuda LP drive doing duty in a FreeNAS box.
Some people have reported that these drives have problems that devolve into an issue with a clicking sound coming from the drive, followed by failure. I noticed that if the power usage level of the drive was changed to allow spindown, it would do so every few minutes. That's not good.