Recording device and curl determination method

A curl determination method comprising:

• dividing a recording region of a medium, which includes four side edges, into a plurality of regions, and setting, as a determination region, a continuous region in which at least two of the plurality of regions are continued and which includes an end part region which is the closest region to a corner section, in which two side edges are connected, of the medium, the determination region being less than an entirety of the plurality of regions;
• calculating an average value of liquid volume ratios only for the determination region, the calculating of the average value including calculating the average value of the liquid volume ratios of the at least two of the plurality of the regions, which have been set as the determination region, each of the liquid volume ratios of the at least two of the plurality of the regions being a ratio of the liquid, which is discharged from a recording section to each of the at least two of the plurality of the regions set as the determination region based on the discharge data of the liquid which is discharged from a recording section to the medium, to a maximum liquid volume of the liquid which is configured to be discharged from the recording section;
• and
• determining whether or not the average value of the liquid volume ratios, which are calculated only for the determination region, is larger than a predetermined threshold, and determining that curls are generated in the medium when determining that the average value is larger than the threshold.