QSC26404 User’s Manual82Appendix B: HDD Capacity CalculationTo calculate total capacity needed by each DVR according to video recording (video recordingtype and video file storage time).Step 1: Use Formula (1) to calculate storage capacity iq that is the capacity of each channelneeded for every 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 capacity im , which is the storage needed by each channel: unit Mbyte.im = iq × ih × iD (2)In the formula:ih represents the recording time for each day (hours)iD represents the number of days for which the video will be keptStep 3: Use Formula (3) to calculate total capacity (accumulation) Tq that is needed for allchannels in the DVR during scheduled video recording.∑==ciiT mq 1(3)In the formula: c represents total number of channels in one DVRStep 4: Use Formula (4) to calculate total capacity (accumulation) Tq that is needed for allchannels in DVR during alarm video recording (including motion detection).∑==ciiT mq 1×a% (4)In the formula：a% represents alarm occurrence rate
