© Copyright Qvis® All documentation rights reserved. 210Appendix A HDD Capacity CalculationCalculate total capacity needed by each DVR according to video recording (video recording typeand video file storage time).Step 1: According to Formula (1) to calculate storage capacityiq that is the capacity of eachchannel needed for each hour, unit Mbyte.102436008 ii dq(1)In the formula:id means the bit rate, unit Kbit/sStep 2: After video time requirement is confirmed, according to Formula (2) to calculate thestorage capacityim , which is storage of each channel needed unit Mbyte.im=iq ×ih ×iD (2)In the formula:ihmeans the recording time for each day (hour)iDmeans number of days for which the video shall be keptStep 3: According to Formula (3) to calculate total capacity (accumulation)Tq that is needed forall channels in the DVR during scheduled video recording.ciiT mq 1(3)In the formula:c means total number of channels in one DVRStep 4: According to Formula (4) to calculate total capacity (accumulation)Tq that is needed forall channels in DVR during alarm video recording (including motion detection).ciiT mq 1×a% (4)In the formula：a% means alarm occurrence rate
