Delete a image.dd file

Hi have a macbook pro running 10.8.5 with 500 gb of memory. I got an alert saying that my start up disk was almost full. I looked through my files and I have 1 file named image.dd taking up 425 gb. Can I delete it to help my start up disk memory issue?

 

Thanks. I just realized that this may have been a result of me using some "sudo" (?) commands while trying to recover some deleted files I put in the trash and emptied. I used the terminal to do this. I'm not a computer wizard so I probably shouldn't have done this but I followed some directions in a video and everything seemed to work fine, besides the 425 gb file i created. Now, I'm not sure if I should delete it to free up space.

 

Here's What I get:

XXXXX-MacBook-Pro:~ XXXXX$
XXXXX-MacBook-Pro:~ XXXXXXX$ ~/Library/Preferences/

XXXXX-MacBook-Pro:~ XXXXXXX$ defaults write com.apple.Finder AppleShowAllFiles YES

XXXXX-MacBook-Pro:~ XXXXXXX$ /Users/XXXXXXX/Desktop/testdisk-7.0/testdisk ; exit;

XXXXX-MacBook-Pro:~ XXXXXXX$ /Users/XXXXXXX/Desktop/testdisk-7.0\ 2/testdisk ; exit;

XXXXX-MacBook-Pro:~ XXXXXXX$ sudo rm -R

xxxxx-MacBook-Pro:~ xxxxxxx$ /Users/xxxxxxx/Desktop/testdisk-7.0/testdisk ; exit;

The X's are just redactions. THank you.

 

That's as far back as it goes. However, this is the video I watched to retrieve the files in the trash folder I emptied:

 

This .dd file is in the trash now but I haven't emptied the trash. It's taking up 425 gigs so I want to empty it from the trash but I'm not sure if that will completely screw up my computer. I haven't noticed any difference since moving the file to the trash.

 

THank you!