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Video Storage & Retrieval Systems Flashcards

7 cards from real CCTV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Video Storage & Retrieval Systems flashcards as text

  1. What is the purpose of RAID in a CCTV storage system?

    Answer: To provide data redundancy and fault tolerance across multiple drives

    RAID (Redundant Array of Independent Disks) distributes or mirrors data across multiple drives to protect against data loss if a single drive fails.

  2. Which RAID level mirrors data across two drives, providing full redundancy with 50% usable capacity?

    Answer: RAID 1

    RAID 1 mirrors identical data on two drives; if one fails, the other contains a complete copy, but only half the total capacity is usable.

  3. Before exporting CCTV footage as evidence, the operator should:

    Answer: Create a hash checksum to verify file integrity

    Generating a cryptographic hash (e.g., MD5 or SHA-256) before export establishes a verifiable chain of custody by confirming the footage has not been altered.

  4. What term describes the process of searching stored video to find a specific recorded event?

    Answer: Video retrieval

    Video retrieval is the process of locating, accessing, and playing back specific recorded footage from a DVR/NVR based on time, date, camera, or event criteria.

  5. Which feature allows a CCTV system to immediately locate recorded footage triggered by a specific alarm or sensor event?

    Answer: Event-based or alarm-triggered recording index

    An event-based recording index tags footage segments tied to alarms or sensor triggers, enabling operators to jump directly to relevant footage without scrubbing through hours of recording.

  6. Offsite or cloud backup of CCTV recordings is primarily used to:

    Answer: Protect footage from on-site theft, fire, or hardware failure

    Offsite or cloud backup ensures footage survives local disasters, theft of recording equipment, or hardware failure by maintaining a separate copy at a remote location.

  7. What does the term 'bitrate' refer to in CCTV video storage?

    Answer: The amount of data processed or recorded per second

    Bitrate measures the amount of video data (in bits per second) recorded or transmitted; higher bitrates produce better quality but require more storage space.