If you lock the tray - it will prevent you from accidentally ejecting a DVD that you are currently erasing or writing a DVD.
Read
If enabled the program will lock the tray during a read operation.
The default setting is 'enabled'.
Write
If enabled the program will lock the tray during a write operation.
The default setting is 'enabled'.
Verify
If enabled the program will lock the tray during a verify operation.
The default setting is 'enabled'.
Erase
If enabled the program will lock the tray during an erase operation.
The default setting is 'enabled'.
Eject Tray After...
You can set as an option that the tray is automatically ejected upon completing of the writing or erasing process.
Read
If enabled the program will eject the tray after a read operation.
The default setting is 'disabled'.
Write
If enabled the program will eject the tray after a write operation.
The default setting is 'disabled'.
Verify
If enabled the program will eject the tray after a verify operation.
The default setting is 'disabled'.
Erase
If enabled the program will eject the tray after an erase operation.
The default setting is 'disabled'.
Disable Media Change Notification
If enabled it stops the entire OS from knowing a disc has been inserted - only affects the currently selected drive. Useful for discs with 'Autorun' content and where a player would jump in and try to play the disc as ImgBurn is trying to initialise it.
The default setting is 'enabled'.
Sort By
This indicates how ImgBurn sorts the list of drives (in case you have multiple drives).
None
Address
Drive Letter
Name
Operating System Options
Auto Insert Notification
This is nothing to do with ImgBurn really, it's a global OS thing. The OS defaults to having it enabled. When it's disabled, no drives will autorun stuff when you insert a disc - regardless of if ImgBurn is loaded or not.