portable CD player to usb flash drive player ?

i have 2 or 3 portable cd mp3 players - sony atrac cd mp3 player, panasonic SL SX 430.

these cd payers can play songs in mp3 format in a CD.
source of power battery or direct electricity.

since cds are not used so much nowadays.

is it possible to hack or attach a usb port to these players and use them as flash drive players for
home audio system or stereo ??????

if possible, how is it done .
can some one help with that.

Nope. Good news is MP3 players are really cheap.