Using host transfer rates to select a recording medium transfer rate for transferring data to a recording medium

A controller implementing a program in a storage device coupled to a host, wherein the storage device has a recording medium and a buffer to buffer data transferred between the host and the recording medium, wherein the program is executed to cause the controller to perform operations comprising:

• measuring a host transfer rate of data with respect to the buffer;
• providing a plurality of recording medium transfer rates at which data is transferred between the buffer and the recording medium;
• determining an amount of decrease in the host transfer rate;
• selecting the recording medium transfer rate from the plurality of recording medium transfer rates based on one of a plurality of ranges including the amount of decrease in the host transfer rate;
• and
• setting a transfer rate in the storage device at which data to the selected recording medium is transferred.

A method, comprising:

• measuring a host transfer rate of data with respect to a buffer in a storage device that buffer data transferred between a recording medium and a host;
• providing a plurality of recording medium transfer rates at which data is transferred between the buffer to the recording medium;
• determining an amount of decrease in the host transfer rate;
• selecting the recording medium transfer rate from the plurality of recording medium transfer rates based on one of a plurality of ranges including the amount of decrease in the host transfer rate;
• and
• setting a transfer rate in the storage device at which data to the selected recording medium is transferred.