Q-See QT Series User Manual

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Q-See QT Series User Manual Manual pdf 69 page image

699.2 CALCULATING THE RECORDING CAPACITY OF A HARD DRIVEWhile the physical data capacity of a hard drive is fixed, how much video you can record uponit depends on your recording configurations. Higher quality recordings will take up more spaceon the drive and setting the DVR to record for more frequently will fill it up more rapidly.To determine the optimal capacity for your purposes, the chart below to estimate the size ofhard drive that you’ll need.VIDEOFORMATRESOLUTION FRAME RATE(FPS)VIDEOQUALITYBIT RATE(bps)SPACE USED(MB/h)NTSC/PAL CIF 30/25 Highest 1000k 465Higher 768k 297Medium 512k 230Lower 256k 115Lowest 128k 56D1 30/25 Highest 2M 912Higher 1.5M 512Medium 1M 468Lower 768k 300Lowest 512k 244D1 7.5/6 Highest 500k 228Higher 375k 128Medium 250k 117Lower 192k 75Lowest 128k 611080P 30/25 Highest 48M 5400Higher 36M 4052Medium 28M 3152Lower 16M 1800Lowest 6M 6767.5/6 Highest 12M 1350Higher 9M 1013Medium 7M 788Lower 4M 450Lowest 1.5M 169The formula for calculating the required disk space is:Total Recording Capacity = Used space per hour (MB/h) x Recording time (hour) xnumber of channelsExample: A customer is using the NTSC format (30 frames per second), CIF resolutionwith video quality set to Lowest and a total of 16 Channels. He wants the unit to recordcontinuously for a month. Therefore, the calculation will look like this:56(MB/h), x 24 (hours/day) x 30 (days) x 16 (channels) = 645,120MB or 650GBInstalling a 750GB SATA hard drive should provide enough space for one month’s continuousrecording time at those settings.