Yes, disc is a Scrabble word!
...and is worth 7 points in Scrabble, and 8 points in Words with Friends
disc
Noun
1. Sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove
2. Something with a round shape resembling a flat circular plate
3. (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
4. A flat circular plate
What Scrabble words can I make with the letters in disc?
3 Letter Words
2 Letter Words