hdd format and video file storage into the hdd in the remote ?

Assuming you are using Linux on the DM355 than you can use standard Linux commands to partition and format mass storage devices, there is a lot of documentation out there on the net for this sort of thing, this site is just the first return from a google search. These commands can be run on the board from the UART terminal.

As to having this done by the remote, you would have to modify the remote handling software (for example the interface portion of the demo) to run the partitioning and formatting commands.