Method of controlling magnetic disk unit based on version data

A method of controlling a magnetic disk unit which comprises a disk enclosure part and a printed-circuit board part, said disk enclosure part including at least one magnetic disk, at least one magnetic head and a mechanical part for driving each magnetic disk and each magnetic head, said printed circuit board part including a circuit part for controlling the disk enclosure part, said method comprising the steps of:

• (a) writing version data indicating a type of the disk enclosure part after the disk enclosure part and the printed-circuit board part are assembled;
• and
• (b) automatically setting the circuit part of the printed-circuit board part depending on the version data which is read from the magnetic disk after the magnetic disk unit is completed;
• wherein said step (a) includes writing delay data on the magnetic disk indicating a delay time of a read circuit within the circuit part of the printed-circuit board part together with the version data, said step (b) includes setting the delay time of the read circuit within the circuit part of the printed-circuit board part to an optimum delay time depending on the delay data read from the magnetic disk.

A method of controlling a magnetic disk unit which comprises a disk enclosure part and a printed-circuit board part, the disk enclosure part including at least one magnetic disk, at least one magnetic head and a mechanical part for driving each magnetic disk and each magnetic head, said printed-circuit board part including a circuit part for controlling the disk enclosure part, said method comprising the steps of:

• (a) assembling the disk enclosure part and the printed-circuit board part;
• (b) after said step (a) and prior to optimization and setting of circuit parameters of the printed circuit board part, writing version data indicating a type of the disk enclosure part onto said magnetic disk, said version data including a control number and a serial number of the disk enclosure part;
• (c) reading the version data which was written during step (b);
• and
• (d) setting the parameters of the circuit part of the printed-circuit board part necessary for controlling the magnetic disk unit, including setting a delay time of the read circuit within the circuit part of the printed-circuit board part, wherein
• each of said steps (a)-(d) is performed during the production of the magnetic disk unit.

A method of controlling a magnetic disk unit which comprises a disk enclosure part and a printed-circuit board part, the disk enclosure part including at least one magnetic disk, at least one magnetic head and a mechanical part for driving each magnetic disk and each magnetic head, said printed-circuit board part including a circuit part for controlling the disk enclosure part, said method comprising the steps of:

• (a) assembling the disk enclosure part and the printed-circuit board part;
• (b) after said step (a) and prior to optimization and setting of circuit parameters of the printed circuit board part, writing version data indicating a type of the disk enclosure part onto said magnetic disk, said version data including a control number and a serial number of the disk enclosure part, wherein writing said version data includes writing delay data on the magnetic disk indicating a delay time of a read circuit within the circuit part of the printed-circuit board part together with the version data;
• (c) reading the version data which was written during step (b);
• and
• (d) setting the parameters of the circuit part of the printed-circuit board part necessary for controlling the magnetic disk unit, including setting the delay time of the read circuit within the circuit part of the printed-circuit board part to an optimum delay time, said optimum delay time depending on the delay data read from the magnetic disk, wherein
• each of said steps (a)-(d) is performed during the production of the magnetic disk unit.