An optical scanner A for a video recording disc B includes a photo detector 6 for sensing the light from {HEAD ~ a laser source} 1 reflected back from {TAIL ~ the disc} 
An optical scanner A for a video recording disc B includes a photo detector 6 for sensing the light from { HEAD ~ a laser source } 1 reflected back from { TAIL ~ the disc }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL