Abstract: A mapping table management method for a solid state storage device is provided. The solid state storage device includes a control circuit, a dynamic random access memory and a non-volatile memory. The mapping table management method includes the following steps. When the control circuit receives a write command, the control circuit stores a write data into the non-volatile memory and updates a mapping table in the dynamic random access memory. If the control circuit receives a power-off command, the control circuit stores an entire of the mapping table from the dynamic random access memory to the non-volatile memory. If the control circuit judges that an update condition is satisfied, the control circuit stores a portion of the mapping table from the dynamic random access memory to the non-volatile memory.

Abstract: A data writing method for a solid state storage device is provided. The solid state storage device includes a flash memory with plural blocks. The data writing method includes the following steps. Firstly, a flush command is received. Then, host write data in a buffer are stored into an open block of the flash memory according to a program order. Then, a garbage collection is performed to acquire collected write data from a close block of the flash memory and temporarily store the collected write data into the buffer. Then, the host write data and the collected write data in the buffer are stored into the open block of the flash memory according to the program order.

Abstract: A data writing method for a solid state storage device is provided. The solid state storage device includes a flash memory with plural blocks. The data writing method includes the following steps. Firstly, a flush command is received. Then, host write data in a buffer are stored into an open block of the flash memory according to a program order. Then, a garbage collection is performed to acquire collected write data from a close block of the flash memory and temporarily store the collected write data into the buffer. Then, the host write data and the collected write data in the buffer are stored into the open block of the flash memory according to the program order.

Abstract: A data writing method for a solid state storage device includes following steps. A step (a) is performed to judge whether a shutdown command is issued from a host. In a step (b), if the solid state storage device confirms that the shutdown command is not issued from the host, plural program procedures are performed. Consequently, plural write data in a buffer are stored to a triple-level cell flash memory according to a program order. In a step (c), if the solid state storage device confirms that the shutdown command is issued from the host, plural redundant data are added to the plural write data, the write data are stored into the buffer, and the plural program procedures are performed. Consequently, the plural write data in the buffer are stored to the triple-level cell flash memory according to the program order.

Abstract: A data writing method for a solid state storage device includes following steps. A step (a) is performed to judge whether a shutdown command is issued from a host. In a step (b), if the solid state storage device confirms that the shutdown command is not issued from the host, plural program procedures are performed. Consequently, plural write data in a buffer are stored to a triple-level cell flash memory according to a program order. In a step (c), if the solid state storage device confirms that the shutdown command is issued from the host, plural redundant data are added to the plural write data, the write data are stored into the buffer, and the plural program procedures are performed. Consequently, the plural write data in the buffer are stored to the triple-level cell flash memory according to the program order.

Abstract: A method for moving a pickup head module to the initial position used in an optical disk drive without a touch sensor includes moving the pickup head module toward a spindle motor according to a gradually decreasing speed curve until the pickup head stops. When power is provided to the optical disk drive, recording a present address of a disk corresponding to the pickup head module after seeking and accessing the disk. Calculating a return distance according to the present address and the initial address of the disk and moving the pickup head module for the return distance toward the spindle motor.

Abstract: A method of stable focus control for an optical drive is disclosed. When the signal processing circuit of the optical drive detects a focus drop, the rotation speed of the spindle motor is detected and compared to a predetermined rotation speed. When the rotation speed of the spindle motor is faster than the predetermined rotation speed, the spindle motor brakes to re-focus, and the focus servo mechanism is reset from open-loop control to closed-loop control. Thus, the focus point is locked on the optical disk.