Method of and apparatus for controlling data storage system according to temperature, and medium
AssigneeSamsung Electronics Co., Ltd.
InventorSeung-hyun Song
Life of this patent
Estimating the term…
Abstract
A method of and an apparatus for controlling a data storage system according to a temperature which thermally expands a write head pole tip of a write head includes supplying the write head with a predetermined warming current in a low temperature environment, so as to prevent a degradation of a writing characteristic of a signal in an initial writing stage. Therefore, errors due to a degradation of a signal level written in a sector of an initial writing mode do not occur by performing a warming write using the predetermined warming current so that data existing in a storage system before performing a writing mode is not erased, and by sufficiently thermally expanding the write head pole tip of the write head until a saturation state before writing starts.
Claims25
A method of controlling a data storage system having a write head, the method comprising:
- detecting a temperature of the data storage system and determining whether the detected temperature is below a critical temperature;
- upon determining that the detected temperature is below the critical temperature, determining whether a read and/or write current is enabled;
- and
- enabling a predetermined warming write current to be supplied to the write head while the read and/or write current is not enabled.
An apparatus for controlling a data storage system having a write head, the apparatus comprising:
- a temperature sensor which senses a temperature of the data storage system;
- a controller which enables a predetermined warming write current if the temperature sensed by the temperature sensor is below a predetermined critical temperature;
- and
- a write driver which supplies the writing head with the predetermined warming write current.
A method of setting a warming write current in a data storage system, the method comprising:
- measuring a first bit error rate in a predetermined test zone of a medium;
- rotating the predetermined test zone a predetermined number of times while changing a value of a warming write current applied to a write head;
- measuring a second bit error rate according to the value of the warming current in the predetermined test zone;
- calculating a difference between the first bit error rate and the second bit error rate;
- and
- comparing the difference with a predetermined critical value to determine the value of the warming current as a warming write current when the difference is below the predetermined critical value.
An apparatus for controlling a data storage system having a write head, the apparatus comprising:
- a controller measuring a first bit error rate in a predetermined test zone of a medium, measuring a second bit error rate according to a current supplied to the write head in the predetermined test zone, calculating a difference between the first bit error rate and the second bit error rate, and determining a value of the current as a warming write current to be supplied to the write head according to the difference;
- and
- a write driver which supplies the write head with the warming write current determined by the controller.
An apparatus for controlling a data storage system having a write head, the apparatus comprising:
- a temperature sensor which senses a temperature of the data storage system;
- and
- a controller measuring a first bit error rate in a predetermined test zone of a medium, measuring a second bit error rate according to a current supplied to the write head in the predetermined test zone, calculating a difference between the first bit error rate and the second bit error rate, and determining a value of the current as a warming write current to be supplied to the write head according to the temperature and the difference.
A medium compatible with a computer performing a method of controlling a warming write current according to a temperature of a writing head, the medium comprising:
- controlling data used for measuring a first bit error rate in a predetermined test zone of a medium, measuring a second bit error rate according to a current supplied to the write head in the predetermined test zone, calculating a difference between the first bit error rate and the second bit error rate, and determining a value of the current as a warming write current to be supplied to the write head according to the difference;
- and
- driving data used for supplying the write head with the warming write current determined by the controller.
A medium compatible with a computer performing a method of controlling a warming write current according to a temperature of a writing head, the medium comprising:
- temperature reading data used for reading the temperature from the writing head;
- and
- controlling data used for measuring a first bit error rate from a predetermined test zone of another medium, measuring a second bit error rate according to a current supplied to the write head in the predetermined test zone of the another medium, calculating a difference between the first bit error rate and the second bit error rate, and determining a value of the current as a second warming write current to be supplied to the write head according to the difference.
Dependencies are inferred from the claim text.