Ocean House, Redfields Industrial Park, Redfields Lane, Church Crookham, Hants, GU52 0RD.

Tel: 01252-851510 Fax: 01252-851296 Email: sales@videoswitch.co.uk

Spotlight on Record Rates

The formula for calculating the hard drive capacity required is simply as follows

Drive capacity = [Image Size] x [Pictures per Second] x [Number of seconds for which images are to be retained]

As an example, we can calculate the required hard drive capacity using these typical values:

Image size: 17kbytes (17000 bytes)
Pictures per second: 50 (shared between all cameras)
Duration: 31 days ( 31 x 24 x 60 x 60 = 2678400 seconds)

Applying the above formula gives a drive capacity of 17000 x 50 x 2678400 = 2,2766,400,000 bytes, which is close to 2250 Gbytes.

This capacity is provided by the Vi605 which we would therefore recommended for 50pps continuous recording over 31 days.

Note that many other brands of DVR claim higher record rates but in reality may be unable to meet this specification due to inadequate hard drive capacity. If alarm recording is assumed bear in mind that when this is used, there is no guarantee as to how long the data will be retained before being overwritten.

To make the calculations easier, why not download our free calculator or view our Model Selector page.