Security NVR or DVR Hard Drive Calculator

​ Looking to upgrade the storage on your Lorex NVR or DVR? Since security recorders are programmed to overwrite the oldest footage with the newest footage, upgrading your hard drive will greatly prolong the number of days that data will be preserved for.

Select your camera resolution, frame rate, number of cameras, recording hours per day, and storage capacity to determine the number of recording days.

Calculated using H.265 HVEC encoding.

*With Motion Recording enabled, you can expect approximately 120 events (30 seconds each) for each hour of recording. Estimate provided is approximate and must be used for reference only when planning storage needs.

Extend Your Recordings​

​ Recorder and camera settings have a direct impact on the size of data. Configure your DVR / NVR to maximize storage space by modifying the following:

Motions or Events

​Record only when motion is detected.


​Record only during selected times during the day.

Frames Per Second

​A lower FPS will decrease video smoothness but reduce file sizes.


A lower recording resolution will decrease file size.


​Reduce data size by 25% to 50% without affecting video quality.

Maximize Your Storage ​

​Due to the high workload rate of 24/7 monitoring, it is strongly recommended to only use Surveillance Grade Hard Drives in Lorex recorders. Note the total supported capacity of your recorder to maximize recording space and your peace-of mind.

Please take note of the following points before purchasing additional storage for your recorder:

  • Number of hard drive bays of your recorder
  • Maximum capacity of each recorder bay
Recorder Series Number of HDD Bays Maximum Storage Capacity

N884 Series

2 bays

16TB per bay (32TB total)

N883 / N882 / N881 Series

2 bays

10TB per bay (20TB total)

N864 Series

2 bays

10TB per bay (20TB total)

N863 Series

2 bays

8TB per bay (16TB total)

N910 Series

1 bay


N847 / N846 / N845 Series

1 bay


N843 Series

1 bay


D242 / D251 / D881 / D863 Series

1 bay


How To Replace Your Hard Drive