Patent ID: 8089833

Claim:
A storage device comprising: a storage medium for storing data in the form of marks in multiple tracks, each of said tracks being aligned along a respective track center line; at least one read transducer for writing and reading said data stored in said storage medium; and an actuator for moving said storage medium relative to said at least one read transducer; the storage device further comprising: stored servo sequences, which are replicated by use of at least two different types of servo marks, each type of servo mark being displaced by a given unique distance in a cross track direction relative to a respective track center line, wherein said storage device is operable to retrieve said servo sequences using read-back signals obtained from said at least two different types of servo marks, said device being operable to retrieve said servo sequences by calculating an estimated amplitude value of each of said read-back signals obtained from said at least two different types of servo marks and assigning a respective weight thereto.