Magnetic disk device and retry method for a magnetic disk device

A retry method of a magnetic disk device comprising the steps of:

• receiving commands from a host computer by an interface control means;
• storing said received commands in a command queue;
• detecting a load level of the interface with said host computer by determining a total number of commands stored in said command queue and reading a load level corresponding to the total number of commands from a table that associates load levels with numbers of commands stored in the command queue;
• and
• fetching and executing a command from said command queue and, when retry of said command is necessary, performing said retry in accordance with at least a portion of a retry process stored in a retry table in association with the detected load level.

A magnetic disk device comprising:

• a driving means that includes a magnetic disk and that drives said magnetic disk;
• a reading/writing means for reading or writing data, that includes error detecting means;
• a positioning means for determining the position of said reading/writing means on said magnetic disk;
• an interface control means for communicating with a host computer;
• a command queue for storing commands received in said interface control means;
• a load detecting means for detecting a load level of the interface control means by determining a total number of commands stored in said command queue and reading a load level corresponding to the total number of commands from a table that associates load levels with numbers of commands stored in said command queue;
• a retry table storing contents of retry processes that correspond to said respective load levels;
• and
• executing means for fetching and executing a command from said command queue, and when retry of said command is necessary, performing said retry in accordance with at least a portion of a retry process corresponding to a load level detected by said load detecting means,
• wherein said executing means refers to said retry table each time a retry of a same sector on a medium is executed and obtains from said retry table a portion of a retry process that corresponds to the load level detected at the time of the retry.

A retry method of a magnetic disk device comprising the steps of:

• receiving commands from a host computer by an interface control means;
• storing said received commands in a command queue;
• detecting a load level of the interface with said host computer by determining a total number of commands stored in said command queue and reading a load level corresponding to the total number of commands from a table that associates load levels with numbers of commands stored in the command queue;
• and
• fetching and executing a command from said command queue and, when retry of said command is necessary, performing said retry using at least a portion of a retry process stored in a retry table in association with a detected load level,
• wherein said retry table is referred to each time a retry of a same sector on a medium is executed to obtain from said retry table a portion of a retry process that corresponds to a load level detected at the time of the retry.