Abstract: The present disclosure generally relates to a dual free layer (DFL) read head and methods of forming thereof. In one embodiment, a method of forming a DFL read head comprises depositing a DFL sensor, defining a stripe height of the DFL sensor, depositing a rear bias (RB) adjacent to the DFL sensor, defining a track width of the DFL sensor and the RB, and depositing synthetic antiferromagnetic (SAF) soft bias (SB) side shields adjacent to the DFL sensor. In another embodiment, a method of forming a DFL read head comprises depositing a DFL sensor, defining a track width of the DFL sensor, depositing SAF SB side shields adjacent to the DFL sensor, defining a stripe height of the DFL sensor and the SAF SB side shield, depositing a RB adjacent to the DFL sensor and the SAF SB side shield, and defining a track width of the RB.

Abstract: A writing method for a solid state drive is provided. Firstly, a buffer is divided into plural buffering regions corresponding to plural data streams. Then, the write command is received from a host, and a write data corresponding to the stream information of the write command is stored into the corresponding buffering region of the buffer. Then, the write data in each buffering region of the buffer is divided into plural groups according to a program data amount. Then, one program command is assigned to each group in each buffering region, the program command and each group are combined as a job, and the job is listed in a stream job link list. Afterwards, the jobs corresponding to each data stream are transmitted to a non-volatile memory according to a content of the stream job link list.

Abstract: A read retry method for a solid state storage device is provided. The solid state storage device is in communication with a host. The solid state storage device includes a non-volatile memory. The read retry method includes the following steps. Firstly, the solid state storage device judges whether a specified read block of the non-volatile memory is in a specified failure mode. If the specified read block of the non-volatile memory is in the specified failure mode, a failure mode read retry process corresponding to the specified failure mode is performed. If an accurate read data is acquired in the failure mode read retry process, the accurate read data is transmitted to the host. If the accurate read data is not acquired in the failure mode read retry process, a read fail message is sent to the host.

Abstract: A writing method for a solid state drive is provided. Firstly, a buffer is divided into plural buffering regions corresponding to plural data streams. Then, the write command is received from a host, and a write data corresponding to the stream information of the write command is stored into the corresponding buffering region of the buffer. Then, the write data in each buffering region of the buffer is divided into plural groups according to a program data amount. Then, one program command is assigned to each group in each buffering region, the program command and each group are combined as a job, and the job is listed in a stream job link list. Afterwards, the jobs corresponding to each data stream are transmitted to a non-volatile memory according to a content of the stream job link list.

Abstract: A read retry method for a solid state storage device is provided. The solid state storage device is in communication with a host. The solid state storage device includes a non-volatile memory. The read retry method includes the following steps. Firstly, the solid state storage device judges whether a specified read block of the non-volatile memory is in a specified failure mode. If the specified read block of the non-volatile memory is in the specified failure mode, a failure mode read retry process corresponding to the specified failure mode is performed. If an accurate read data is acquired in the failure mode read retry process, the accurate read data is transmitted to the host. If the accurate read data is not acquired in the failure mode read retry process, a read fail message is sent to the host.

Abstract: A start-up method of an optical disk drive, comprising: starting to accelerate a spindle motor after initializing a digital signal processor; starting an laser diode driver of an optical pickup head after the spindle motor starts accelerating; and starting a servo control of the optical pickup head. During the step of starting the laser diode driver, the spindle motor is accelerating.

Abstract: A start-up method of an optical disk drive, comprising: starting to accelerate a spindle motor after initializing a digital signal processor; starting an laser diode driver of an optical pickup head after the spindle motor starts accelerating; and starting a servo control of the optical pickup head. During the step of starting the laser diode driver, the spindle motor is accelerating.

Abstract: A method for stopping a spindle motor of an optical disc drive includes the following steps. Firstly, in response to the receipt of a disabling command, the spindle motor of the optical disc drive is braked, so that a rotating speed of the spindle motor is reduced to be smaller than or equal to a predetermined rotating speed during a specified time period, wherein the predetermined rotating speed is greater than zero. Then, a preparatory stopping procedure of an optical pickup head is performed during the specified time period. Afterwards, the optical disc drive responds that the disabling command has been executed after the specified time period.