JEITA  CP-3451 - 79 - The structure of fact-ck is illustrated in Figure 37. The value of ckSize is fixed at '00000004.H' (this value is used in Write processing).   Address Offset Code Meaning (Hex) (Hex) +00 66 +01 61 +02 63 +03 74 "fact" (ckID) +04 04 +05 00 +06 00 +07 00 00000004.H (ckSize) +08 dwSampleLength (4 Bytes) ckData[ckSize] Figure 37 fact-ck Structure <data-ck> data-ck (data chunk) is a chunk for storing audio data. Its ckID (chunk ID) is "data". The  ckData  (chunk  Data)  of  data-ck  consists  of  the  audio  data  only.  In  some  cases  the  chunk  is  filled  out  with padding bytes.   The audio data is coded based on the format type. The information in fmt-ck is used when the audio data is played back.   The ckSize (chunk Size) of data-ck is the size of the coded audio data only. The structure of data-ck is illustrated in Figure 38. Address Offset Code Meaning (Hex) (Hex) +00 64 +01 61 +02 74 +03 61 "data" (ckID) +04 ckSize (4 Bytes) Size of audio data +08 ckData[ckSize] Coded audio data Figure 38 data-ck Structure