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8. Index Table
The following description details how the NVR-2028 manages an index table issue.
The NVR will generate a time index table indicating recorded data is kept in a particular HDD. This
allows to individually selecting recorded data to be displayed via the alarm list search and full list
search. The maximum number of lists, for a given HDD, is 3000. When the list of any given HDD is
used up-and the disk is not full, The unit will still use the rest of the space for recording. In such a
case, an index for the recent recorded data will be generated and the index of the next oldest data
will be erased so that the list does remain 3000 in total. And the next oldest data will be kept in the
index of the corresponding oldest data. For any newly-recorded data, this approach will be applied
until the disk becomes full.
HD1
HD1
1 12-02-02 12:20:55
1 12-02-02 12:20:55
2 12-02-02 13:30:33
2 01-30-03 16:00:34
3 01-30-03 16:00:34
:
: :
: :
:
2999 02-03-03 16:00:56
3000 LISTS
3000 02-03-03 16:00:56
3000 02-08-03 17:30:58
3000 LISTS
In the rewrite recording mode, when the archived hard disk drive is full, the NVR will start overwriting
the oldest data recorded. As the previous recorded data was partially overwritten by the recent
recording, the indicating time index of that data will be changed corresponding to the starting time of
the remaining session. The index of the session will be deleted from the table when it is fully
overwritten.
Previously
recorded data
overwritten
Previously recorded data remaining
The point stops recording