Patent ID: 8307163

Claim:
A hybrid density memory storage device, which is suitable for being used as a data storage device in conjunction with a host computer and its file system, said hybrid density memory storage device comprising: a non-volatile memory unit, which comprises a high density memory storage space and a low density memory storage space; a hot data buffer; and a control unit, which is coupled between the host computer, the non-volatile memory unit and the hot data buffer, wherein the control unit has a hot list to record a plurality of logical locations of the file system associated with hot data, allowing for the control unit to access the hot data from the hot data buffer according to the hot list; wherein, when an operation mode of the host computer is a start mode or a read mode, the control unit selects at least one of the logical locations in the hot list and preloads a first data corresponding to the selected logical location from the non-volatile memory unit to the hot data buffer, and the control unit further determines whether the first data preloaded in the hot data buffer matches requirement of a command issued by the host computer operating in the start mode or the read mode, when the first data preloaded in the hot data buffer fails to match the requirement of the command issued by the host computer operating in the start mode or the read mode, the control unit further determines whether the command issued by the host computer matches any other logical location recorded in the hot list, and if there is no match, the control unit updates the hot list based on the logical location of the command and executes the command issued by the host computer operating in the start mode or the read mode; and when the operation mode of the host computer is a write mode the control unit is configured to preload a second data that the host computer is configured to write to the hot data buffer, and to receive a write command issued by the host computer.