ATRAC3plus and ATRAC3
"ATRAC3plus," which stands for "Adaptive Transform Acoustic Coding3plus" is audio
compression technology, developed from the ATRAC3 format. Though the ATRAC3plus format
can compress music content to about 1/20 of its original size at 64 kbps, you can still enjoy high
quality sound. The available transfer bit rates are 256 kbps, 64 kbps and 48 kbps.
"ATRAC3," which stands for "Adaptive Transform Acoustic Coding3" is audio compression
technology that satisfies the demand for high sound quality and high compression rates. The
ATRAC3 format can compress music content to about 1/10 of their original size, which
contributes to reduction of the media volume. The available transfer bit rates are 132 kbps,
105 kbps and 66 kbps.
The usable number of groups and files
• Maximum number of groups: 255
• Maximum number of files: 999
For details, refer to the supplied booklet "SonicStage."
Note on saving files on the media
Do not save files in other formats (except MP3 files) and do not make unnecessary folders on a
disc that has ATRAC3plus/ATRAC3 files.
MP3, which stands for MPEG-1 Audio Layer3, a standard for audio files compression supported
by the Motion Picture Experts Group, an ISO (International Organization for Standardization)
working group, enables compression of audio files to about 1/10 of the data size of a standard
The major specifications of the acceptable disc format are:
• Maximum directory levels: 8
• Acceptable characters: A - Z, a- z, 0 - 9, _ (underscore)
• When naming files, be sure to add the file extension "mp3" to the file name.
• If you add the extension "mp3" to a file other than an MP3 file, the player will not be able to recognize the