A company you just started working for, Parts Are Us, sells auto parts. The company has 200 stores in North America. There are normally 15-20 people that work in each store, and they all have a local tower server with a local application, StoreApp, that provides all of the information about the parts and products sold in the local store. The servers that are deployed all use (2) 400 GB basic disks and the concern is that there is only enough free space on these disks as the application grows. The application disk utilization if growing about 25 % per year.

Snapshot of a representative server:
Tower server with (2) quad-core processing boards, GPU and RAID card
Running Windows Server 2012 R2
Space for 5 disk drives (5 bays)
2 of the 5 bays are being used, 1 for the Windows os and 1 for the store application
- Disk 1 - Windows Server 2012 R2
- Disk 2-Store App Application disk
Disk1 30 % utilized
Disk2 85 % utilized

Disk drives available from the hardware vendor:
Same 400 GB drives used in the server currently
Larger 600 GB drive but these are more expensive

Goal:
Use the same server hardware but purchase additional disks to put in each server.
Provide better method to protect the data from a disk failure.
Ensure disk utilization is always less than 60%.
Provide more disk space that will last for the next 3 years of growth.

Given the scenario described above, recommend a new disk configuration to meet the described goals. Describe the steps, at a high level, for implementing your new disk configuration.