Patent ID: 8792317

Claim:
An optical storage system that receives an optical medium having a plurality of tracks for storing data, the system comprising: an optical head having a first coherent light source modulated at higher power during writing of data to the optical medium and a second coherent light source operating in a continuous wave mode at lower power while the first coherent light source is writing data, optics that combine light from the first and second light sources and focus light from the first coherent light source to a first spot of a selected track on the optical medium and focus light from the second coherent light source to a second spot on the selected track downstream from the first spot relative to movement direction of the optical medium, the optics directing reflected light from the optical medium to a photodetector; and a controller coupled to the optical head that selectively positions the optical head for writing data along the selected track using the first coherent light source while reading data directly after writing from the selected track using reflected light from the second coherent light source detected by the photodetector and compares the data read to the data written to provide data verification of the data.