Optical data storage system with focus and tracking error correction

An optical data storage method, comprising:

• (a) providing an optical storage medium including a read-write layer and a servo plane, said servo plane including embossed servo information thereon;
• (b) recording a format hologram in said read-write layer by interference of a signal beam and a reference beam in said read-write layer;
• (c) addressing said servo plane with a servo laser beam and a servo focus spot;
• (d) addressing said data plane with a read-write laser and read-write focus spot;
• (e) locally altering said format hologram with a read-write beam to form a plurality of localized alterations, said localized alterations including stored data, said localized alterations Including embedded servo information;
• (f) providing focus and tracking error correction with a first servo system associated with said servo beam and servo information included in said servo plane;
• and
• providing focus and tracking error correction with a second servo system associated with said read-write beam and servo information embedded in said data plane.

An optical data storage method, comprising the steps of:

• providing an optical medium including a servo plane and at least one data plane:
• generating a servo laser beam with a first laser and addressing said servo plane with a first servo focus spot;
• generating a read-write laser beam with a second laser and addressing said data plane with a second read-write locus spot;
• providing, with a first servo system servo system associated with said first laser, focus and tracking error correction according to servo information associated with said servo plane;
• and
• providing, with a second servo system associated with said second laser, focus and tracking error correction according to servo information associated with said data plane.