Patent ID: 7984315
Filing Date: 2011-07-19
Classification: G06F,G11B,Y02D

Abstract:
1. An external storage device which is configured to be connected to a host device to perform data communication with the host device and is configured to be switched between a normal operation mode and a power save mode, the external storage device comprising: a media control section configured to drive a recording media and perform data access to the recording media; a monitoring section configured to monitor whether the data access by the media control section can be performed or not; a control section configured to issue, when the external storage device is operated in the normal operation mode and it is detected by the monitoring section that the data access can not be performed, a command of requesting permission for shift to the power save mode to the host device and issue, when the external storage device is operated in the power save mode and it is detected by the monitoring section that the data access can be performed, a command of notifying the host device of shift to the normal operation; an interface section configured to perform data communication between the host device and the media control section; and a power control section configured to selectively limit, when the control section receives notification of permission for shift to the power save mode from the host device, power supply to the interface section and restart, when the control section issues the command of notifying the host device of shift to the normal operation mode, the power supply.