To Detach Selected Raster Files

Do one of the following:

In the Raster Manager dialog, click the name of the image to detach.

or
Select the Raster Selection tool, and select a raster image.
(Optional) Hold down the <Ctrl> key and select additional file names or interactively select raster images.
You also can hold down the <Shift> key to select consecutive file names in the Raster Manager dialog.
Do one of the following:

In the Raster Manager dialog, select File > Detach.

or
With the pointer in the Raster Manager file list box, right-click the mouse (press the right mouse button) and select Detach from the right-click menu.

If the variables MS_RASTER_NO_DETACH_CONFIRM=0 and RASTER SILENT ON are set, an alert box asks if you are sure that you want to detach the selected raster reference(s). You can turn Off the alert box with the key-in MS_RASTER_NO_DETACH_CONFIRM=1 . In order to activate the MS_RASTER_NO_DETACH_CONFIRM configuration variable, the product needs to be exited and reopened.
Click OK.
If you made changes to the raster reference's native information and Autosave is set to Off, an Alert box asks if you want to save the changes.
Click your selection (Yes, Yes To All or No) or Cancel to exit without detaching.