naxx

Hi there, I have been using a MZ-RH1 Minidisc record for a while now and last night was recording a band. I checked during the show and it all seemed fine. During the encores I checked and the recorder had stopped. I started a new recording a new recording and though nothing of it. But when I got home the initial recording was no on the disc. Is there any way to recover the initial recording? Any help would be great. Thank you