You all have been really helpful, thank you all.
Shane, I used to find firewire 800 disks in all local stores but now it’s really hard to find them, that’s why I said they are “disappearing”, I assume that they are going to gradually stop selling them and replace them for usb 3 disks.
Steve, I used to buy my disks online but now I prefer to buy them at local stores because of a bad experience I’ve had (the disks arrived damaged and it was a big hassle to return them and get some new ones).
Also, here in Europe we have few (if any) good online stores that sell these disks, and buying them from the US is always a problem because of the customs.
I’ve decided to go for a OWC Mercury Elite enclosure, it seems to be the best solution for me (thanks for that Shane).
Once again, thank you all