A data storage device includes a first data storage surface and a second data storage below the first data storage surface. The data storage device also includes a first micro-actuator coupled to a first arm that supports a first head over the first data storage surface, and a second micro-actuator coupled to a second arm that supports a second head over the second data storage surface. The data storage device further includes a coarse actuator, to which the first and second arms are coupled, that positions the first head and the second head between corresponding first and second tracks on the respective first and second data storage surfaces. Micro-actuator drive circuitry finely positions the first head over the first track and the second head over the second track by concurrently driving the first micro-actuator and the second micro-actuator in opposite directions.

Zone self-servo write (SSW) technology is disclosed that leverages two clock signals synchronized in parallel to transition between zones to write servo patterns at different frequencies while minimizing error rate despite the different frequencies. Two separate clock signals (clocks) are used to locate and lock to different reference spirals. By updating both clocks in parallel instead of in series, error rate for writing while stepping up frequency across zones is reduced.

Zone self-servo write (SSW) technology is disclosed that leverages two clock signals synchronized in parallel to transition between zones to write servo patterns at different frequencies while minimizing error rate despite the different frequencies. Two separate clock signals (clocks) are used to locate and lock to different reference spirals. By updating both clocks in parallel instead of in series, error rate for writing while stepping up frequency across zones is reduced.

A waveform data structure includes a plurality of types of frames having different data sizes. Each of the plurality of types of frames includes an auxiliary information area and a data area. The auxiliary information area includes an area for storing common effective-bit length data for a section of waveform samples, and an area for storing an identifier for identifying one of the plurality of types of frames. The data area is an area for storing extracted waveform samples which are extracted from the waveform samples based on the common effective-bit length. The number of the extracted waveform samples is determined based on the common effective-bit length.

A playback device and playback method are provided for reading out and playing content from a recording medium in which are recorded a video stream that is encoded video information, map information, and bitrate information of the video stream. The map information includes playback start time information, start position information, and size information. The playback method includes reading out the map information and the bitrate information, and determining the stipulated data size in accordance with the bitrate information. The playback method also includes acquiring the picture from the video stream based on the result of the determination, and the start position information and the size information included in the map information that has been read out. The method further includes decoding and playing the acquired picture, wherein the stipulated data size differs between 2K resolution of the video stream and 4K resolution of the video stream.

A waveform data structure includes a plurality of types of frames having different data sizes. Each of the plurality of types of frames includes an auxiliary information area and a data area. The auxiliary information area includes an area for storing common effective-bit length data for a section of waveform samples, and an area for storing an identifier for identifying one of the plurality of types of frames. The data area is an area for storing extracted waveform samples which are extracted from the waveform samples based on the common effective-bit length. The number of the extracted waveform samples is determined based on the common effective-bit length.

Recorded in a recording medium is a video stream, map information, and bitrate information of the video stream. The map information includes size information indicating data size of a section where a picture is recorded in the video stream, based on a predetermined stipulated data size. The stipulated data size differs in accordance with the bitrate information.

A waveform data structure includes a plurality of types of frames having different data sizes. Each of the plurality of types of frames includes an auxiliary information area and a data area. The auxiliary information area includes an area for storing common effective-bit length data for a section of waveform samples, and an area for storing an identifier for identifying one of the plurality of types of frames. The data area is an area for storing extracted waveform samples which are extracted from the waveform samples based on the common effective-bit length. The number of the extracted waveform samples is determined based on the common effective-bit length.

A playback device and playback method are provided for reading out and playing content from a recording medium in which are recorded a video stream that is encoded video information, map information, and bitrate information of the video stream. The map information includes playback start time information, start position information, and size information. The playback method includes reading out the map information and the bitrate information, and determining the stipulated data size in accordance with the bitrate information. The playback method also includes acquiring the picture from the video stream based on the result of the determination, and the start position information and the size information included in the map information that has been read out. The method further includes decoding and playing the acquired picture, wherein the stipulated data size differs between 2K resolution of the video stream and 4K resolution of the video stream.

A recording medium is provided in which are recorded a video stream that is encoded video information, map information, and bitrate information of the video stream. The map information includes playback start time information of a picture that is independently decodable, start position information indicating a data start position of the picture, and size information indicating a data size of a section where the picture is recorded, based on a predetermined stipulated data size, which differs in accordance with the bitrate information. The size information indicates a data size based on a first stipulated data size, where the bitrate information indicates a bitrate larger than a predetermined value, and indicates a data size based on a second stipulated data size that is smaller than the first stipulated data size, where the bitrate information indicates a bitrate equal to or smaller than the predetermined value.