The structure of atrac3plus/atrac3 and mp3 files – Sony D-NE900 User Manual

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The usable number of groups and files

• Maximum number of groups: 255
• Maximum number of files: 999

Settings for compression and writing software

• This CD player is able to play MP3 files with the following specifications: Bit rate:

16 - 320 kbps, and sampling frequencies: 32/44.1/ 48 kHz. Variable Bit Rate (VBR) file can
also be played.
To compress a source for an MP3 file, we recommend setting the compression software to
“44.1 kHz,” “128 kbps,” and “Constant Bit Rate.”

• To record up to the maximum capacity, set to “halting of writing.”
• To record at one time up to the maximum capacity on media that has nothing recorded on it,

set to “Disc at Once.”

Notes on saving files on the media

• Do not save files in other formats (except MP3/ATRAC3plus/ATRAC3 format files) or

unnecessary folders on a disc that has MP3 files.

• When a disc is inserted, the CD player reads all the information of folders and files on that

disc. If there are many folders on the disc, it may take a long time for play to begin or for the
next file to start playback.

The structure of ATRAC3plus/ATRAC3 and MP3
files

Groups and folders

The ATRAC3plus/ATRAC3 format has a very simple structure. It consists of “files” and
“groups.” A “file” is equivalent to a “track” of an audio CD. A “group” is a bundle of files and is
equivalent to an “album.” A “group” has no directory-type structure (a new group cannot be
made within an existing group).
When referring to MP3 CDs, a “file” is equivalent to a “track” and a “group” is equivalent to an
“album.” This CD player is designed to recognize an MP3 folder as a “group” so that it can play
CD-Rs/RWs recorded in both the ATRAC3plus/ATRAC3 format and those recorded in the MP3
format with the same operation.

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