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10. 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 kept on a particular HDD. This allows the
user to individually select the recorded data to be displayed via the alarm list search and full list search. The
maximum number of lis ts for a given HDD is 3,000 . 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 3,000 in total. 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 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 s ession.
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