24.3 What is the recording capacity of the VDR?
Under IEC 61996-1 each of the recording mediums have the following recording requirements…
Recordings include NMEA, Audio and Video data sources along with additional support files –
config, log files etc. Each one is stored in a separately time stamped data file on all media. Older
files are removed to make space for newer files.
The storage space is always around 95% full as the system needs the additional 5% for
managing files.
For a system with the following configuration the amount of historic data that can be recorded is
estimated as follows:
Note:
1. Audio and Video sources consume considerably more storage resources than
NMEA.
2. Video recordings are typically stored every 15s from a source. Storage time is
dependent on compression and picture format used by the source.
The indicated number of hours in the previous table are indicative of measurements
with image resolution as follows:
a) VGA – 1696 x 1250
b) LWE 450* – 1920 x 1080
3. Video recordings with higher resolutions require additional storage space and could
compromise the minimum storage requirements.
For example: LWE 450** 3840 x 1080 with 90% compression indicated above.
Although this satisfies the LTRM requirement it will not satisfy the FRM and FFRM
requirement and will not be compliant with IEC 61996.
The amount of time that has been stored, for each area compared to IEC61996 requirements,
is available on the BCU status page.
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