Disk drive and method for performing realtime processing and non-realtime processing simultaneously

A disk drive comprising:

• a disk on which data for a realtime processing is recorded;
• a cache for temporarily storing data read from said disk and data transferred from a host;
• and
• a control section configured to control data transfer between said cache and the host and between said cache and said disk;
• wherein, when a realtime processing command is received during an after write operation and there is a cache miss for said realtime processing command, said control section executes said realtime processing command with priority by interrupting said after write operation.

A method for performing a realtime processing and a non-realtime processing simultaneously by a disk drive comprising a disk on which data for a realtime processing is recorded;

• a timer for managing times;
• a cache for temporarily storing data read from said disk and data transferred from a host;
• and a control section having registers that are accessible from the host and controlling data transfer between said cache and the host and between said cache and said disk;
• said method comprising:
• receiving a non-realtime processing command;
• setting a time limit of execution of the received non-realtime processing command in said timer and starting the process;
• and
• if the execution of said non-realtime processing command is not completed within said time limit, interrupting the execution of said non-realtime processing command forcibly, setting a data transfer status to the host at the time of the interruption in said registers and reporting to the host that said non-realtime processing command is terminated.