Storage costs are now very affordable and are decreasing further, with HDD storage relatively inexpensive and NVRs allowing flexible, tailored recording schedules.
IP CCTV systems store video recordings on hard disk drives (HDDs). HDDs were originally developed for use in the computer industry, and the cost per Gigabyte of storage continues to go down year on year. This trend is almost certain to continue, irrespective of whether the hard disk is contained within a PC, network video recorder or other storage device.
Although hard disk drive storage costs continue to go down, it is worth having an archiving plan to ensure that vital information is retained, and unwanted information is neither recorded nor retained. A RAID5 system can be used to provide essential back-up in case of HDD failure. This is especially useful as we move to larger and larger drives (1Tbyte) and beyond, as fewer drives are used in the system. It’s possible to implement RAID5 by adding one extra drive.
Modern NVRs can record to a schedule, against an alarm trigger or against video motion detection (VMD), and the recording quality and frame rate set accordingly. Many modern security systems for corporate applications record high quality images in real time against VMD during the day, and high quality images at 13 images per second (ips) continually out of operating hours.
As HDD storage is relatively inexpensive, the main criteria should be to ensure that the storage is reliable. Many industry pundits consider that purpose-built professional network video recorders and expansion
bays offer the most reliable hardware for IP CCTV system image storage.
No comments:
Post a Comment