Data storage system with complex memory and method of operating the same

Abstract

A data storage system and a data storing method for the data storage system are provided. The data storage system includes a host unit, a storage unit, and a first input / output bus functioning as an interface between the host unit and the storage unit. The storage unit includes a non-volatile memory buffer unit and a flash memory unit. The non-volatile memory buffer unit includes a plurality of buffers arranged in parallel. The flash memory unit includes a plurality of data storage devices arranged in parallel to input and output data using a parallel method. In the method, a writing request is first classified into one of a plurality of grades according to a writing request frequency when there is a writing request and the writing requested data is stored in one of the non-volatile memory buffer unit and the flash memory unit according to the writing request frequency.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION [0001] This application claims the benefit of Korean Patent Application No. 10-2005-0063301, filed on Jul. 13, 2005, and Korean Patent Application No. 10-2005-0076368, filed on Aug. 19, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a data storage system and method of operating the same, and more particularly, to a data storage system with a complex memory comprising a flash memory and a method of operating the data storage system. [0004] 2. Description of the Related Art [0005] Data storage systems using a flash memory device have been widely used in an embedded system and a mobile system. The data storage system using a flash memory device is one of electrically erasable programmable read-only memories (EEPROMs) on and from which the data can be written, read...

AI Technical Summary

Benefits of technology

[0015] The present invention provides a data storage system with a complex memory that has an increased writing speed realized by managing only data which will be frequently updated in a writing buffer taking advantage of spatial locality and can reduce the number of writing and erasing operations for the flash memory that is an advantage obtained by using the buffer while reducing the size of the buffer.

Problems solved by technology

While reading speed of the data storage system using a flash memory device is fast, writing and erasing speeds thereof are slow.

That is, for the NAND-type memory device, the erasing operation is relatively slow.

That is, the writing speed of data storage systems using the flash memory device is far slower than that of the RAM device.

In addition, a data storage system using a flash memory device cannot perform real-time data storing operation.

Thus, there are limitations in using the data storage systems using a flash memory device in a digital product such as a digital camera or a digital camcorder.

However, even when the erasing operation is hidden using the FTL, the writing speed of flash memory devices are still slow compared to RAM devices.

Particularly, flash memory devices are very limited in being used in a device such as the digital camera, camcorder and mobile phone that process and store data in real-time.

However, when the writing operation is done only in the cash, the data may be erased if power is turned off before the data is stored in the flash memory device.

That is, the data maintenance that is a basic condition of the data storage system cannot be ensured.

Therefore, although the reading performance is improved, the an ideal writing performance is not yet satisfied.

This leads to a deterioration of the writing performance.

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