Lumens Technology PS750 - Manual (Page 37)

English - 36
The Removable Disc will select SD card if a SD card has
been inserted, but if a SD card has not been inserted, the Removable
Disc is internal memory
Doing this will disable the [Capture] function. Suggest you
return it to [Camera] mode after using this function. Please follow
the
8.23.5 Steps 1 ~ 5 .