3BChapter 4: Recording 
24  TruVision DVR 11 and DVR 11c User Manual 
scheduling external alarms, see “Triggering or clearing alarm outputs manually” 
on page 32. 
Protecting recorded files 
There are two methods to prevent recorded files from being inadvertently 
overwritten or deleted off the HDD. We highly recommend that important 
recorded events be protected from deletion. Recorded files can either be locked 
or the HDD that the files reside on can be set to read only. 
Locking and unlocking recorded files 
Lock files to protect them against being overwritten or deleted. 
To lock or unlock a recorded file: 
1.  In live view enter the video search window by pressing the Search button on 
the front panel or remote control, and then enter Advanced Search. 
— Or — 
In live view right-click the mouse to display the pop-up menu and select 
Advanced Search. 
The Search window appears by default for the Normal tab (TVR 11 is shown 
below). 
 
2.  Search for the desired recording by entering the search parameters, which 
include the camera number, record type, file type, and start time and end 
time. 
3.  Click Search.  
A list of recordings, similar to the figure below, matching the search 
parameters is displayed.