Magnetic disk drive and read/write method to reduce read error rate

A method for reading/writing user data in a magnetic disk drive that comprises a magnetic disk and a slider on which a write head and a read head are positioned at a predetermined spacing interval, the method comprising:

• placing said read head at a target position and writing said user data at a first position with said write head;
• a DHO correction step including making a DHO correction of said first position and placing said read head at a second position;
• a first read step including reading said user data at said second position;
• a DHO adjustment data read step including reading DHO adjustment data, which is written at said second position and corresponds to the difference between said first position and said second position;
• and
• a second read step including adjusting the position of said read head and reading said user data in response to said DHO adjustment data read step.

A magnetic disk drive comprising:

• a slider on which a write head and a read head are positioned at a predetermined spacing interval;
• a head support mechanism that carries said slider and pivots on a rotation shaft;
• a magnetic disk on which DHO adjustment data is written and placed at a target position for a user data write;
• and
• a processor configured to exercise operational control over said magnetic disk drive to read said DHO adjustment data with said read head, adjust the position of said read head, and write said user data.

A method for reading/writing user data in a magnetic disk drive that comprises a magnetic disk on which a servo track is written, and a slider on which a write head and a read head are positioned at a predetermined spacing interval, the method comprising:

• a DHO adjustment data read step including placing said read head at a target position and reading DHO adjustment data;
• a position adjustment step including adjusting the position of said write head in response to said DHO adjustment data read step;
• and
• writing said user data with said write head whose position is adjusted.