USB music file player

About playable USB memory standards

Supported standards:
MPEG-1
MPEG-2
MPEG-2.5
Audio Layer III
Supported sampling frequencies:
MPEG-1:32, 44.1 (kHz)
MPEG-2:16, 22.05, 24 (kHz)
MPEG-2.5:8, 11.025, 12 (kHz)
Supported bit rate:
MPEG-1: 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 288, 320 (kbps)
MPEG-2: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160 (kbps)
MPEG-2.5: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160 (kbps)
^*1 Supports VBR. (8~320 kbps)
^*2 Does not support free format.
Supported channel modes:
monaural, stereo, joint, dual

Supported standards:
WMA Ver. 7
WMA Ver. 8
WMA Ver. 9
Supported sampling frequencies:
8, 11.025, 12, 22.05, 32, 44.1 (kHz)
Supported bit rate:
8, 16, 24, 32, 40, 48, 64, 80, 96, 128, 160, 192 (kbps)
^*1 Supports VBR (40~95 kbps)
^*2 Does not play DRM.
Supported channel modes:
monaural, stereo

The USB memory format must be ISO9660 Level 1 or Level 2.
Standards are as follows:

Maximum directory layers:
8 layers
Maximum characters for folder names/file names:
128 (including “.” and 3 letter file extension)
Allowable characters for folder names/file names:
A~Z, 0~9, _ (underscore)
Number of files possible on a single USB memory:
3000
Total number of folders possible on a single USB memory:
999
Maximum folders this main unit can recognize:
1000*
^*1 A root directory is counted as one folder.