Most external USB hard drives will be compatible but Channel Master has thoroughly tested, can provide support, and recommends the following External Storage Devices.
Recommended External Hard Drive for a (CM-7500).
Each drive can store a maximum of 999 recordings.
While many other external hard drives will work with the DVR+, Channel Master cannot guarantee that all other external hard drives will be compatible.
Hard Drive - 1TB Toshiba EHD ( HDTB310XK3AA )
Note: Hard Drive models may come and go from this list of actively supported hard drives. If your Hard Drive model is no longer on the list, it means the manufacturer has discontinued this model or Channel Master is no longer supporting this model when used with the DVR+.