Storage device and data processing method thereof

A storage device, comprising a host controller, a memory and a storage medium controller, wherein, the memory and the storage medium controller are connected to the host controller,

• the memory is configured to store program data,
• the host controller is configured to execute the program data, so as to implement a data processing method comprising:
• receiving a data processing command;
• converting the data processing command into a plurality of groups of subcommands, wherein, each group of subcommands comprises at least one subcommand;
• caching each group of subcommands in a corresponding storage element;
• and
• submitting the subcommands in each storage element to a storage medium controller in sequence to execute the subcommands, and submitting, in response to at least two subcommands existing in the storage element, a previous subcommand and a data address of a subsequent subcommand simultaneously.