Precompensation based on nearby data

An apparatus comprising:

• a circuit configured to:
• adjust a timing of a transition of a first signal to store data to a selected data storage region of a selected track of a data storage medium based on data patterns of another track adjacent to the selected track;
• the selected data storage region is a structure that stores one bit of data;
• a first bit group including the selected data storage region and at least one bit from the another track;
• and
• the circuit is further configured to adjust the timing based on a bit pattern value of the first bit group;
• another bit group including at least one bit from the another track not included in the first bit group;
• and
• the circuit is further configured to adjust the timing based on the bit pattern value of the first bit group and a bit pattern value of the another bit group;
• the apparatus further comprising:
• a table configured to store timing adjustment values based on a bit pattern of the first bit group and another bit pattern from the another bit group;
• and
• the circuit is further configured to determine the timing from the table based on the bit pattern of the first bit group and a determined adjacent bit pattern;
• and
• the circuit further configured to:
• determine if the another bit pattern is stored in a memory;
• when the another bit pattern is stored in a memory, adjust the timing;
• and
• when the another bit pattern is not stored in the memory, read the another bit pattern from the data storage medium into the memory;
• and
• when the another bit pattern is not in the memory,
• determine if a timer has expired;
• when the timer has not expired, read the another bit pattern from the data storage medium into the memory and adjust the timing by the timing adjustment value;
• and
• when the timer has expired, store data to the selected data storage region without adjusting the timing.