|I would recommend that you build your own. Buy a GOOD enclosure with a fan and then buy whatever size HDrive you want and install the HDrive. |
You will end up with a unit that you can open without voiding warranties and probably with a better hard drive. Although the first link you provide is from a known brand the unit is geared toward backups and as such there is backup software pre-installed. Also has no fan. Fanless enclosures are OK for intermittent use. If you intend to keep it connected and running all the time then get one with a fan.
What will you do to back up all the files you store on there? Consider getting a unit that can hold two drives for redundancy.
The link below is one example of what I am suggesting.
Another point to mention is that if your motherboard has an eSATA port that is much faster than USB or firewire.
The second drive you linked is re-certified. Why do you think that is? Those drives do not last past the warranty period.