System and method for quality of service assurance of multi-stream scenarios in a hard disk drive

A computer system for facilitating data placement, the system comprising:

• a processor;
• and
• a memory coupled to the processor and storing instructions, which when executed by the processor cause the processor to perform a method, wherein the computer system is a storage device, the method comprising:
• receiving incoming data from multiple streams, wherein the incoming data includes a plurality of data parts;
• formatting the data parts by inserting a header before and a tail after each data part, wherein a formatted data part includes a respective data part, the header, and the tail, and wherein the header and the tail indicate an order and a destination zone for the respective data part within a stream;
• sequentially writing the formatted data parts to a pre-allocated journal zone of a non-volatile memory of the storage device;
• concatenating the data parts in the order indicated by their respective header and tail;
• and
• sequentially writing the concatenated data parts to the non-volatile memory based on the destination zone indicated by their respective header and tail.

An apparatus for facilitating data placement, the apparatus comprising:

• a communication unit configured to receive incoming data from multiple streams, wherein the incoming data includes a plurality of data parts;
• a data-formatting unit configured to format the data parts by inserting a header before and a tail after each data part, wherein a formatted data part includes a respective data part, the header, and the tail, and wherein the header and the tail indicate an order and a destination zone for the respective data part within a stream;
• a journal zone-managing unit configured to sequentially write the formatted data parts to a pre-allocated journal zone of a non-volatile memory of the storage device;
• a data-concatenating unit configured to concatenate the data parts in the order indicated by their respective header and tail;
• and
• a data-writing unit configured to sequentially write the concatenated data parts to the non-volatile memory based on the destination zone indicated by their respective header and tail.