Nikon 775 - Manual (Page 163)

149
Ref
erence–Connections
Disconnecting the Camera During image Transfer
Confirm that image transfer is complete and the message
“TRANSFER COMPLETED” is displayed in the camera
monitor, before performing any of the above operations.
Do not turn the camera off, disconnect the cable or re-
move the memory card while the transfer progress meter
is displayed in the computer monitor.