| 摘要 |
A storage device that improves ability of adjusting a resistance value level in recording and enables stable verification control is provided. VWL supplied from a second power source to a control terminal of a transistor is increased (increase portion: &Dgr;VWL) for every rerecording by verification control by a WL adjustment circuit. In the case where a variable resistive element is able to record multiple values, &Dgr;VWL is a value variable for every resistance value level of multiple value information. That is, &Dgr;VWL is a value variable according to magnitude relation of a variation range of recording resistance of the variable resistive element due to a current. In the region where the variation range of the recording resistance is large (source-gate voltage VGS of the transistor is small), &Dgr;VWL is small, while in the region where the variation range of the recording resistance is small (VGS is large), &Dgr;VWL is large. |
