Disk drive and servo pattern write method for preventing read errors resulting from a thermal asperity within an erase area between a servo pad area and a gray code area

Granted: Mar 7, 2000 Filed: Dec 2, 1997

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.