If an incident occurs that operators did not notice, or the system did not pick up, then chances are it would be lost. It is very important for a surveillance manager to know what the storage retention is. Some users call this short-term storage retention. In other words, if recorders have a drive capacity to store for only 14 days, an incident that occurred three weeks previously cannot be retrieved – it would have been overwritten by the new recording during the last 14 days. Short-term storage is the recycling of the available storage space using the first in first out (FIFO) principle. They then realised the size of this new data storage market. Hard disk manufacturers were ignorant of the CCTV and surveillance industry until it switched to digital storage. The surveillance industry is one of the largest consumers of data storage media because of the need for constant recording of information from cameras (with the associated time/date, GPS, various interfaces and so on).
The need for data storage grows exponentially with every new mega-pixel sensor and with every new technology (which was high definition video until only a year or two ago) today the 4k, tomorrow 8k and beyond. Each new day in surveillance requires new terabytes of storage space for the thousands of cameras around various cities, major towns and regional areas including shopping centres, factories and prisons, to name a few. In today’s world, all visual and audio data is now in digital format.
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