Background on Hard Disk Drives
Traditional hard drives operate by storing data on one or more spinning metal disks, called platters. The more platters there are in a drive, and the more data that can be crammed onto each platter, is what determines the overall storage capacity of a given hard drive. Having more platters also tends to mean louder drives, though rotational speed affects that as well. Rotational speed also impacts the drive's performance: if platters spin faster the drive can reach data in different areas more quickly and read or write more information per second.
The alternative to hard drives is solid state drives, which are many times faster but much more expensive for the same amount of capacity. The price gap is dropping over time, so SSDs are becoming more and more preferred for us. For performance, reliability, and noise reduction, SSDs are really the way to go.
We have an article where you can read about the differences between the Red and Green series in more depth here.
Specifications:

Capacity | 42,000 GB |
Rotation Speed | 5400 rpm |
Interface | SATA 6 Gb/s |
Cache Size | 512 MB |
Form Factor | 3.5 Inch |
Idle Noise | 20 dB |
Seek Noise | 29 dB |
Command Queueing | NCQ |
Peak Power Draw | 6.5 Watts |
Large Drive Mounting | Yes |
Performance | |
Sequential Read | 210 MB/s |
Sequential Write | 210 MB/s |
Configure a custom computer with the Western Digital Red 14TB SATA3.