Dat file size change possible?

[Premiere]

This is what I would do in the terminal
The easiest way... I think
make a copy of your dat file
cp datfile /home/
get the size exact size
ls -l --block-size=M yourdatfile
Take Note
Then simply
dd bs=1M seek=your-numbers-Above-no-letters if=/dev/zero of=yourdatfile count=numberOfAdditionalMegaBytes
Then simple open in gparted
sudo gparted yourdatfile
right click your virtualdrive file and select check, and then hit the check mark button (apply all operations button) it will automatically resize the ext file system.
That's the easiest way I can think of.

Hope this helps.