Magnetic disk device and method of ordering commands based on selected scale

A magnetic disk device connected to a host, the magnetic disk device comprising:

• a magnetic disk having a recording surface;
• a magnetic head that accesses the recording surface;
• and
• a controller that sets, as a first storage area in which data is to be written by a shingled magnetic recording (SMR) method, one or more first sections out of a plurality of first sections, the plurality of first sections each capable of being written up to a first volume of data by the SMR method, being obtained by dividing the recording surface in a radial direction in units of first memory areas,
• the controller that provides each of the plurality of first sections with numerical information on a first scale corresponding to a sequence in which the plurality of first sections are arranged in the radial direction,
• the controller that sets, as a second storage area in which data is to be written by a conventional magnetic recording (CMR) method, one or more second sections out of a plurality of second sections, the plurality of second sections each capable of being written up to the first volume of data by the CMR method being obtained by dividing the recording surface in the radial direction in units of second memory areas in each of which,
• the controller that provides each of the plurality of second sections with numerical information on a second scale corresponding to a sequence in which the plurality of second sections are arranged in the radial direction, and
• the controller that, when a plurality of commands, each of which is a command that requests access to one of the first storage area and the second storage area, are received from the host, i) selects one scale from the first scale and the second scale, ii) converts numerical information, provided to sections to be accessed in accordance with the plurality of commands, into numerical information on a third scale, the third scale corresponding to the selected scale, and iii) executes the plurality of commands in order based on the numerical information, on the third scale, which has been obtained by converting the numerical information provided to the sections to be accessed.