Recording media drive and control method for power-save modes thereof

A recording media drive which executes serial data communication with a host according to a clock, said recording media drive comprising:

• a receiver which receives a request switching to a power-save mode accompanying an inactive system clock;
• a transmitter which transmits, in responding to said switching request received, an approval request for said host to execute a reset request signal that is not based on a clock to said host through said serial data communication;
• a controller which outputs a shutdown instruction of part of an internal circuit in responding to said switching request and judges if said approval from said host is received or not;
• and
• a system clock generator which, when said controller judged said approval is not received, continues generating a system clock.

A control method for a power-save mode in a recording media drive which executes serial data communication with a host according to a clock, said control method comprising:

• receiving a request switching to the power-save mode accompanying an inactive system clock;
• requesting approval for said host to transmit a control signal that is not based on a clock to said host;
• and
• stopping said system clock in responding to reception of said approval from the host.

A control method for a power-save mode in a media drive which executes serial data communication with a host according to a clock, said control method comprising:

• receiving from the host a request switching to the power-save mode accompanying an inactive system clock;
• requesting to the host approval for said host to transmit a control signal that is not based on a clock;
• and
• continuing generating said system clock when said approval is not received from said host.