Solid state storage device and data writing method thereof

A solid state storage device connected with a host, the solid state storage device comprising:

• a buffer;
• a controller connected with the host and the buffer, wherein the controller receives host data from the host, converts the host data into host write data, and temporarily stores the host write data into the buffer;
• and
• a flash memory connected with the controller,
• wherein when a flush command from the host is received, the controller stores the host write data into an open block of the flash memory according to a program order, the controller performs a garbage collection to acquire collected write data from a close block of the flash memory and temporarily store the collected write data into the buffer, and the controller stores the host write data or the collected write data in the buffer to be stored into the open block of the flash memory according to the program order.

A data writing method for a solid state storage device, the solid state storage device comprising a flash memory with plural blocks, the data writing method comprising steps of:

• in response to a write command, receiving host data from a host, converting the host data into host write data, and temporarily storing the host write data into a buffer;
• receiving a flush command;
• performing a garbage collection to acquire collected write data from a close block of the flash memory and temporarily store the collected write data into the buffer;
• and
• storing host write data and the collected write data in the buffer into the open block of the flash memory according to a program order.