Western Digital 8TB Purple Pro 3.5″ WD Surveillance Internal Hard Disk Drive HDD SATA 6Gb/s 256MB Cache Size Disk Speed (RPM) 7200 RPM , Data Transfer Rate up to 267MB/s, CMR Recording Technology |WD8002PURP

Western Digital 10TB Purple Pro 3.5″ WD Surveillance Internal Hard Disk Drive HDD SATA 6Gb/s 256MB Cache Size Disk Speed (RPM) 7200 RPM , Data Transfer Rate up to 265MB/s, CMR Recording Technology |WD101PURP

Western Digital 12TB Purple Pro 3.5″ WD Surveillance Internal Hard Disk Drive HDD SATA 6Gb/s 256MB Cache Size Disk Speed (RPM) 7200 RPM , Data Transfer Rate up to 245MB/s, CMR Recording Technology | WD121PURP

Toshiba 10TB HDD S300 Surveillance SATA Internal Hard Drive 3.5" 7200 RPM Speed, 256MB Cache, 24/7 Operation, Supports 64 Cameras

Toshiba 8TB HDD S300 Surveillance SATA Internal Hard Drive 3.5" 7200 RPM Speed, 256MB Cache, 24/7 Operation, Supports 64 Cameras

Toshiba 6TB HDD S300 Surveillance SATA Internal Hard Drive 3.5" 5400 RPM Speed, 256MB Cache, 24/7 Operation, Supports 64 Cameras

Toshiba 4TB HDD S300 Surveillance SATA Internal Hard Drive 3.5" 5400 RPM Speed, 128MB Cache, 24/7 Operation, Supports 64 Cameras

Toshiba 2TB HDD S300 Surveillance SATA Internal Hard Drive 3.5" 5400 RPM Speed, 128MB Cache, 24/7 Operation, Supports 64 Cameras