Avez-vous besoin d'un disque dur pour DVR ou caméras de sécurité

Le stockage vidéo est le composant principal de chaque système de caméra de sécurité . C'est le but de tout un système de vidéosurveillance, avoir des preuves vidéo d'incidents possibles autour de votre propriété.

Lors de la recherche de systèmes de sécurité, vous pouvez rencontrer la question si vous avez besoin d'un disque dur pour les caméras de sécurité et la réponse est compliquée. De nos jours, les systèmes de sécurité sont capables d'enregistrer des séquences à long terme et en haute résolution.

Pour répondre à la question :Les systèmes de caméras de sécurité (DVR, NVR) ont besoin de disques durs pour stocker les enregistrements. Sinon, vous risquez de vous retrouver avec un système qui ne fournit qu'un flux d'affichage en direct. De plus, de nombreuses caméras IP sont équipées de fentes pour carte microSD, ce qui signifie que vous pouvez stocker les vidéos directement sur la caméra, bien que la durée de vie des images soit assez courte.

Dans cet article, nous verrons si les caméras de sécurité ont besoin de disques durs, combien de disques durs, combien de temps vous pouvez enregistrer et dans quels cas vous n'avez pas besoin de disques durs.

Avez-vous besoin d'un disque dur pour les caméras de sécurité DVR ou NVR

Systèmes de caméras de sécurité avec NVR ou DVR

Dans ce cas, les caméras ne sont pas destinées à fonctionner de manière autonome, mais font partie d'un système de vidéosurveillance centré autour d'un enregistreur. Cet enregistreur peut être DVR (pour les caméras analogiques HD) ou NVR (pour les caméras IP).

Toutes les caméras de sécurité envoient le flux vidéo à l'enregistreur qui stocke les images sur ses disques durs (internes). Le nombre de disques durs installés dépend du modèle et du fabricant de l'enregistreur. Certains enregistreurs prennent 2 disques durs, ou 4 morceaux ou même 8, et ainsi de suite. La taille des disques durs commence à partir de 1 To et jusqu'à 12 To par emplacement. Consultez la fiche technique pour savoir quelles tailles de disque dur sont prises en charge.

Fondamentalement, plus il y a de disques durs installés et plus leur capacité est grande, plus les caméras de sécurité enregistreront longtemps. Découvrez la durée de stockage vidéo suffisante pour vous, puis achetez les disques durs. Assurez-vous d'installer des disques durs certifiés CCTV qui sont bien plus fiables et offrent une durée de vie plus longue que les disques durs d'ordinateurs ordinaires.

Use microSD cards to record directly on the security camera

Certain security cameras support microSD cards, they have built-in slots where you can install a microSD card. The size of the cards can vary from 64Gb to 256GB and so on. Consult this article:The best microSD (memory) cards for security cameras .

In this scenario, the security camera will record the footage directly on the microSD card. You can playback and backup the footage of the microSD by using a computer or smartphone app. The downside is that microSD cards are relatively small compared to hard drives and you may only record a few days before the overwrite starts.

This solution is recommended if you don’t need a whole security system, one or two cameras is enough. You can save money and the cameras will still be able to store the recordings on their built-in microSD cards.

Cloud storage

Most IP cameras, NVRs, or DVRs offer the option of cloud recordings which eliminates the need for on-site storage, letting the cloud service provide storage of the recordings on their servers.

Usually, cloud storage providers can record for a longer period of time depending on your needs, let’s say from one month up to a few months. Another thing to keep in mind, nothing will be recorded on the cloud if the internet doesn’t work or its speed is compromised. You need to make sure the internet is stable and the higher the speed, the better.
One potential drawback of CCTV cloud storage is the high cost associated with it. Usually, these providers work on the subscription model, meaning you pay a monthly fee. If you used hard drives on your recorder, there’s no need to pay any fees. If you intend to go for cloud storage, try to balance the cost of the service against physical on-site hard drives.

How many hard drives do you need for your security camera system?

Finding out how many hard drives you need for your CCTV system is about finding how long you want to record, the recorder capability, and the budget.

Determining the right amount of storage for your security system is relatively straightforward. You need to calculate the longevity (how many days you need to store), the number of the cameras, the video resolution, and the bitrate.

Additionally, if you record on motion detection you can double or triple the total days you can have recordings on hard drives. On motion detection, the CCTV system stores videos only when triggered. When nothing happens, nothing is stored. Nowadays most security systems record motion detection by default. However, if not happy, you can set a system to record continuously (24/7).

Generally speaking, it is recommended to store surveillance recordings for at least 30 days which provides video evidence of everything that happened last month. However, many commercial entities prefer storage for up to 90 days, which requires a large amount of storage.

For a security system running on 8 cameras, you may need 4TB-6TB hard drive space for 30 days on motion detection. For 16 cameras, you may need an 8TB-12TB storage space. For 32 cameras you go for 16TB-24TB total space. If you intend to record on continuous mode, you may need twice as much. Important note:Buy CCTV rate hard drives .

Other things to consider are the video resolution (the higher, more store needed), the bitrate, the frame rate (15-20 fps recommended). If you increase any of these parameters, the system will need more storage space to store the recordings. It’s recommended to find the right balance.

Tips to record longer on your security camera system

There are a few ways to improve the efficiency of your video recording and record more days in the CCTV security system without necessarily adding more hard drives or being forced to lower the resolution.

• Set the system to record motion detection, it will record when the motion is detected. Most of the storage is never reviewed, only if there’s an incident you need to take a look. By using motion recording you can record twice or even triple as much.
• Let the system record at specified times of the day, when the cameras are needed the most. For example, you can set the machine to record on timeframes you’re away from the house, and not record if you’re home. This will drastically cut down the video storage required.
• Play with the resolution, frame rate, and bitrate until you achieve a picture quality that you’re happy with. The lower they are, the less video storage required. However, don’t go too low. Try to find the perfect balance.
• Exclude objects that unnecessarily trigger motion detection. Let’s say you have a tree there that moves in the wind and the motion is triggered, meaning the system is recording even if there’s nothing relevant there. You can exclude the tree from the system’s settings, simply deselect that part of the screen.
• Clean the camera every month. Sometimes spider’s web or other insects may trigger the camera for no reason. Wipe the cameras once in a while and make sure no false triggers are occurring

Conclusion

To conclude, a DVR can work without a hard drive, but you won’t be able to record anything, you’ll just be able to see the cameras live on the screen. So, without a hard drive, a DVR or NVR cannot record locally.

A few newer systems offer cloud recording, which means you don’t record on the local hard drive but the footage is stored on the cloud remotely via the internet connection.