A TBGB HDD vs 3 HDD of 1TB each?

[sammael1984]

I am building a new gaming PC and am pondering my options in terms of data storage. I will get an SSD for the OS and probably for the antivirus, I don't know if that would be a good idea though. The point is that I want a good HDD like Caviar Black 3TB. But I was thinking that having everything in one single HDD would be risky or would eventually make my PC slower. I am confused here, guys. Could you please help me decide?

This is my build, in case that matters:

CPU:Intel Core i7-4790K
MOBO:Gigabyte ga-z97mx Gaming 5
GPU:Gtx 980 Gygabyte Gaming 1
Cooler: Noctua NH-D14, S-1366, 1200RPM
RAM: Ddr3 Kingston Hyperx Fury 8gb 1866mhz Pc
HDD: Western Digital Caviar Dark 3.5'', 1TB, SATA III, 6 Gbit/s, 7200RPM, 64MB Cache
SSD: Crucial MX100 128 GB
Power Supply: EVGA SuperNOVA 850 G2
Case: Nzxt H440

 

[USAFRet]

1 drive for OS and applications, other drives for your personal data, and probably games.

Why? When you need to reinstall the OS, your personal data is not affected.