of the most overlooked components when purchasing a
surveillance system is the
size of the
hard drive. The problem is; most users have no idea
what video storage requirements are needed with so many variables. The question
commonly asked our technicians; "is 500GB enough or do I need a terabyte?"
Fortunately, our DVR HDD STORAGE CALCULATOR will give you a good idea what hard
drive size is appropriate based on your response.
Remember, other factors may influence the DVR's hard
drives storage capacity as well as the number of days your DVR will store video.
Common are HD compression and resolution. Check your manufacturers
As with all suggestions listed on
eyespyli.com and/or other ESLI publications, we try to give you a starting
point. All CCTV jobs are different and individual needs have to be taken into
consideration. Please check with one of our trained representatives before
starting any installation.
Did you know bytes are measured through the power of
• One gigabyte is two to the 30th
power in bytes, equaling 1,073,741,824 bytes, or 1,048,576 kilobytes
One half of 1,024 megabytes
512 megabytes is equal to one half of a gigabyte
• 512 gigabytes
is equal to
half of a terabyte
is equal to 1,024 gigabytes
Try several scenarios that best fit your specific situation.
Let's Get Started!
*If the total
fps "recording" speed is 160 on your DVR
and, you have 16 cameras connected to your system, you would
divide 160 ÷ 16. Therefore, the correct answer is ten (10) to the question
"Recorded frames per second on one camera".
your DVR is set to record on "motion", do not include days and/or
hours when area under surveillance is clear of traffic.
***Other factors may influence the DVR's hard drives
storage capacity as well as the number of days your DVR will store video. Most
common are HDD compression and resolution.
FRAME RATE: 1 fps (Frames Per Second) is the lowest frame rate possible.
30 fps (real time) is normally the maximum rate. 1 - 3 fps is the frame
rates most commonly associated with older analog surveillance systems (VCR
based). You can always rewind or review your recordings at higher speed. Most
people find a frame rate of 10 - 15 fps is sufficient.
REAL TIME (30 fps): Most people discover there is little need to record
in real time. Some installations have regulatory reasons to operate at 30 fps/IPS
or faster (government facilities and casinos, for instance). Residential
surveillance installations rarely - if ever - require that frame rate.
fps = Frames Per Second - DVR = Digital Video Recorder -
HD = Hard Drive