Which WD blue to buy?

Wort

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Hey guys. I need a new HDD. I was thinking about getting WD blue, but there's so many different WD blue editions I don't know which one to pick. I have 0 knowledge when it comes to HDDs so I'd ask you guys to help me choose proper HDD. I prefer at least 1TB and 7200rpm for as little money as possible.
THX
 

Wort

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Hey, thanks for your answer.
Beside the one you posted, do you care to explain what is the difference (performance wise) between these:

https://www.hardwareversand.de/5400+rpm/58099/WD+Scorpio+Blue+1TB+WD10JPVT.article
https://www.hardwareversand.de/7200+RPM/62133/WD+Blue+1TB+6Gb%27s.article
https://www.hardwareversand.de/7200+RPM/81346/WD+Desktop+Mainstream+1TB+Retail+%28WD+Blue%29.article
https://www.hardwareversand.de/S-ATA600/79474/WD+Blue+1TB+SATA+6GB+s+9%2C5mm.article

Why is the one you posted the cheapest one? (even cheaper than 5400rpm one)
 

Wort

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Yes I checked it but Scorpio has 300MBps and 8MB buffer size, while the one you posted has 600MBps and 64 buffer size, yet Scorpio is 20€ more expensive.