Magnetic disk device, method for controlling magnetic disk device, and computer program product

A method of controlling a magnetic disk device, the magnetic disk device operating by receiving power supply from a first power source and a second power source, the first power source supplying power with a first voltage, the second power source supplying power with a second voltage higher than the first voltage, the method comprising:

• detecting whether or not power cutoff has occurred in either one of the first power source and the second power source;
• and,
• when the detecting detects the power cutoff having occurred in either one of the first or second power sources, causing the other one of the first or second power sources to supply power to an unnecessary circuit until power down processing is completed in the unnecessary circuit, the unnecessary circuit being a circuit whose power supply is to be stopped.

A computer program product comprising a non-transitory computer-readable recording medium on which a program executable by a computer is recorded, the program instructing the computer to execute processing of controlling a magnetic disk device, the magnetic disk device operating by receiving power supply from a first power source and a second power source, the first power source supplying power with a first voltage, the second power source supplying power with a second voltage higher than the first voltage, the processing to be executed by the computer including:

• detecting whether or not power cutoff has occurred in either one of the first power source and the second power source;
• and,
• when the detecting detects the power cutoff having occurred in either one of the first or second power sources, causing the other one of the first or second power sources to supply power to an unnecessary circuit until power down processing is completed in the unnecessary circuit, the unnecessary circuit being a circuit whose power supply is to be stopped.