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
Which storage format is typically used when exporting CCTV evidence for law enforcement?
Answer: The proprietary format of the DVR/NVR with its player software
Evidence is commonly exported in the system's native proprietary format along with the manufacturer's player software to preserve original quality and maintain chain of custody.
What is the recommended action when a DVR hard drive shows SMART error warnings?
Answer: Replace the drive immediately and restore from backup
SMART errors indicate imminent drive failure; the drive should be replaced immediately and data restored from backup to prevent footage loss.
Variable Bit Rate (VBR) recording is preferred over Constant Bit Rate (CBR) in many CCTV systems because:
Answer: VBR reduces storage consumption during low-activity periods while maintaining quality during high-activity periods
VBR dynamically adjusts the bitrate based on scene complexity, using less storage during quiet periods and allocating more data when motion or detail increases.
What is 'chain of custody' in the context of CCTV video evidence?
Answer: A documented record of who accessed, handled, or transferred evidence and when
Chain of custody is a chronological documentation of every person who has accessed or handled evidence, ensuring its integrity and admissibility in legal proceedings.
Motion-triggered recording differs from continuous recording primarily in that it:
Answer: Only records footage when movement is detected, reducing storage consumption
Motion-triggered recording saves storage by only capturing footage when the system detects movement, significantly reducing the amount of data stored compared to 24/7 continuous recording.
When a CCTV system uses scheduled recording, it means the system:
Answer: Records only during pre-defined time windows, such as business hours or overnight
Scheduled recording configures the DVR/NVR to record during specific time periods, allowing operators to focus storage resources on the highest-risk hours.
Which of the following best describes 'storage redundancy' in a CCTV system?
Answer: Storing the same footage on multiple media or locations to prevent total data loss
Storage redundancy means maintaining duplicate copies of recorded footage on separate drives or systems so that a single failure does not result in permanent loss of surveillance data.