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One
of the most overlooked upgrades
when purchasing a digital video recorder (DVR) is the size of the hard drive.
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.
Most common are HD compression and resolution. Check with your DVR's manufacture
for compression value.
Did you know bytes are measured
through the power of two!
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One gigabyte is two to the 30th power in bytes,
equaling 1,073,741,824 bytes, or 1,048,576 kilobytes or 1,024 megabytes.
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One half of 1,024
megabytes is 512, therefore, 512 megabytes is equal to one half of a gigabyte
and half of a terabyte is 512 gigabytes.
Try several scenarios that best
fit your specific situation.
Let's Get Started!
fps = Frames Per Second - DVR = Digital Video Recorder -
HD = Hard Drive
*If
the total fps recording speed is
160 on your DVR
and, you have 16 cameras connected to
your system, you divide 160
÷ 16. Therefore Ten is
the response to the question "Frames per second on one camera"
**If your DVR is
set to record on motion, do not include days and/or hours when the
recording area 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 HD
compression and resolution. As with all advice 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 with your specific requirements before starting any job.
NOTES:
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.
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