These Western Digital Purple hard drives offer a simple and secure way to extend your NVR or DVR’s internal storage. They’re serial ATA and optimized for natural camera vibrations, as well as for watching or writing video. Depending on the size of your recorder, you could add up to 24TB of total internal storage!
Luma Surveillance™ Hard Drives 
These Western Digital Purple hard drives offer a simple and secure way to extend your NVR or DVR’s internal storage. They’re serial ATA and optimized for natural camera vibrations, as well as for watching or writing video. Depending on the size of your recorder, you could add up to 24TB of total internal storage!
Easy Storage Extension
Bulk up your DVR or NVR with these serial ATA hard drives. You could add up to 24TB of extra internal storage, depending on the number of hard drive bays in your recorder!
Optimized For Surveillance
These hard drives were designed for responsiveness to normal camera frame rate vibration, and were also built for an installer or end user to watch or write video with ease.