Servo systems with augmented servo bursts

摘要

Disk drives are described that include a hybrid servo patterns in which the augmented servo burst fields, which can be Integrated Servo sequences, that provide the PES and also supply additional information such as a SAM, LSBs of the track identifier (TID), sector number, depending on the specific embodiment. Embodiments without write-to-read gaps before the servo sector SIDs are described. The augmented servo burst fields can be read after gapless writing of the preceding data area. For seeking operations the needed bits of the TID without having to detect or decode the Integrated Servo sequences or other augmented servo burst fields. Depending on the embodiment all or the most significant bits of the track identifier can be obtained during seeks by reading the TID fields passing under a read head as the read head moves across tracks without having to detect or decode the Integrated Servo sequences.

主权项

1. A method of operating a disk drive having tracks including a plurality of angularly spaced servo ID fields that include an SAM field, a TID field and an augmented servo burst field, the method comprising:
writing a first set of data bits preceding a first servo ID field on the track with the first set of data bits being positioned without a write-to-read gap between first set of bits of data and first servo ID field; and processing the first servo ID field by ignoring the SAM field and the TID field, then reading the augmented servo burst field.