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11. Index Table
The following description details how the DVR manages an index table issue.
The DVR 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
1
2
3
3000 LISTS
3000
In the rewrite recording mode, when the archived hard disk drive is full, the DVR 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
12-02-02 12:20:55
12-02-02 13:30:33
01-30-03 16:00:34
:
:
:
02-03-03 16:00:56
HD1
1
12-02-02 12:20:55
2
01-30-03 16:00:34
2999
02-03-03 16:00:56
3000
02-08-03 17:30:58
The point stops recording
Previously recorded data remaining
66
:
:
3000 LISTS
:
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