Patent ID: 9053728
Filing Date: 2015-06-09
Classification: G11B

Abstract:
1. A disk drive with a rotatable disk on which information is recorded and retrieved, comprising: a plurality of tracks of information recorded on the disk with at least a first track including a plurality of angularly spaced Servo Identifiers (SIDs) and a plurality of sets of data bits being recorded thereon with one set of data bits being recorded between consecutive SIDs, and each SID including a Servo Address Mark (SAM), a track identifier (TID) field, a P-Burst, a Q-Burst, with the Q-Burst being offset by one-half of a track width from the P-Burst and at least a first Integrated Servo Sequence selected from an allowable set of sequences, the first Integrated Servo Sequence being aligned with the P-Burst and wherein a subset of the SIDs are recorded without a write-to-read gap; and a servo system that has first and second operational modes with the second operational mode being a mini-mode which uses a selected servo gate window that includes the P-Burst, the Q-Burst, and the first Integrated Servo Sequence and skips over the SAM and the TID, the servo system including at least one digital filter that detects the Integrated Servo Sequence and generates a Servo Track Mark (STM) synchronization signal from the Integrated Servo Sequence while operating in mini-mode.