The differences are as follows

discman refers to the Walkman; the CD-ROM Walkman is synonymous with Walkman, and both are trademarks applied by Sony. Later, Walkman replaced discman. However, Walkman is no longer a single reference to Sony products, but a general term for all manufacturers and all personal portable music players.

Vocabulary analysis

discman

Phrases a Discman a record player

Example sentences

1.I used to put them in my Discman and walk around the block because my mom wouldn't let me walk more than one block by myself.

I used to put them in my Discman and walk around the block because my mom wouldn't let me walk more than one block by myself. My mom wouldn’t let me go farther than my neighborhood by myself.

walkman

Phrases

Network Walkman Network Walkman; Walkman

My Walkman My Walkman

a Walkman A Walkman; box

Example sentences

1.I finally found out who took my walkman.

I finally found out who took my walkman. Walkman.

2.Is this your walkman? Yes, thanks.

Is this your walkman? Yes, thank you.