Q-See QC40108 User Manual

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Q-See QC40108 User Manual Manual pdf 31 page image

60 61CHAPTER 8 HARD DISK DRIVEPICTURE 8-1PICTURE 8-2STEP 2. Remove the screw from thehard drive cover. The cover will slideupward for removal.STEP 3. Slide out the old drive (ifpresent). Insert the new drive intothe slot and slide into position. Itshould fit snugly into the connectorsat the bottom. DO NOT FORCE! Ifthe drive does not fit firmly, remove,check alignment and reinstall.Whether installing the drive for the first time or removing the old one to install a new one, thesteps are largely the same:STEP 1. Disconnect the DVR from the power source as well as any other connections.STEP 4. Replace the hard drive cover.8.2 CALCULATING THE RECORDING CAPACITY OF AHARD DISK DRIVEWhile the physical data capacity of a hard drive is fixed, how much video you can record upon it dependson your recording configurations. Higher quality recordings will take up more space on the drive and settingthe 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 of hard drive thatyou’ll need.VIDEOFORMATRESOLUTION FRAMERATE(FPS)VIDEOQUALITYBITRATE(kbps)SPACEUSED(MB/h)NTSC CIF 30 Highest 1M 465Higher 768k 297Medium 512k 230Low 384k 173Lower 256k 115Lowest 128k 56D1 Highest 2M 910Higher 1.5M 712Medium 1M 468Lower 768K 297Lowest 512K 241PAL CIF 25 Highest 1M 466Higher 768k 295Medium 512k 235Low 384k 175Lower 256k 112Lowest 128k 56.4D1 Highest 2M 915Higher 1.5M 700Medium 1M 465Lower 768K 297Lowest 512K 241The 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.