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Index
  • Data CD
  • Audio CD
  • Exact CD Sizes
    •
    Data CD
    Facts:
    • One sector holds 2048 bytes of DATA.
    • The DATA Transfer-rate (single speed) is 150 KBytes/second
      = 153600 bytes/second.
    		 
    Sector Transfer rate
(at 1x speed) 
    =
=
    		 
    153600/2048 sectors/second
75 sectors/second
    		 
    1 MByte DATA
    		 
    =
=
=
    		 
    1048576 bytes DATA
1048576/2048 sectors
512 sectors
    		 
    333000 sectors 
    =
=
=
=
    		 
    333000/75 seconds
4440 seconds
4440/60 minutes
74 minutes
    		 
    333000 sectors 
    =
=
    		 
    333000/512 Mbytes DATA
650 Mbytes DATA
    NOTE: 
    A few CD-R Manufacturers advertise that their CD-R can hold 680 Mb.
They usually (wrongly) assume that:
    1 MByte = 1000000 bytes (instead of 1048576 bytes)
1048576/1000000 * 650 Mb = 681 Mb
    This assumption is totally misleading so be careful what you read.
    index
    Audio CD
    Facts:
    • One sector holds 2352 bytes of AUDIO.
    • The DATA Transfer-rate
    		 =
    =
    =
    =    		 sampling rate * channels * audio bitsize
    44100 * 2 (stereo) * 16 (16 bit) bits/second
    1411200 bits/second
    176400 bytes/second    		 
    Sector Transfer rate
    		 
    =
=
    		 
    176400/2352 sectors/second
75 sectors/second
    		 
    1 MByte AUDIO  
    =
=
=
    		 
    1048576 bytes
1048576/2352 sectors
446 sectors
    		 
    333000 sectors 
    =
=
=
=
    		 
    333000/75 seconds
4440 seconds
4440/60 minutes
74 minutes
    		 
    333000 sectors 
    =
=
    		 
    333000/446 Mbytes AUDIO
747 Mbytes AUDIO
    The reason why an AUDIO CD  holds more data/sector lays in the fact that it uses the complete 2352 bytes to store AUDIO in one sector. This means that an Audio-Byte is per default corrupt as there is no CRC checking. Due to hardware datacorrection these errors are not heard.
    This method can not be used for a Data-Bytes as the data would be corrupt. To fix this problem a DATA sector contains both Data and CRC-CCITT Information.
    CRC-CCITT is a 16 bit EDC (Error Detecting Code). For every byte of data a 16 bit CRC code is calculated, resulting in 128 CRCs, 16 bits each. These CRCs, therefore, take up 256 bytes of the 2352 bytes available. The remaining 48 bytes are reserved for future use. This leaves 2048 bytes available for actual Data.
    NOTE: 
    A few CD-R Manufacturers advertise that their CD-R can hold 680 Mb.
They usually (wrongly) assume that:
    1 Mbytes = 1000000 bytes (instead of 1048576 bytes)
1048576/1000000 * 650 Mb = 681 Mb
    This assumption is totally misleading so be careful what you read.
    index
    Exact CD Sizes
    Playing
    Time
    [min]    		 Disc
    Size
    [mm]    		 AUDIO
    2352 bytes/sector
    [bytes / Mb]    		 CD-ROM Mode 1
    2048 bytes/sector
    [bytes / Mb]    		 CD-ROM Mode 2
    2336 bytes/sector
    [bytes / Mb]    		 CD-i & (XA) Form 1
    2048 bytes/sector
    [bytes / Mb]    		 CD-i & (XA) Form 2
    2324 bytes/sector
    [bytes / Mb]
    80 120 846,717,648
    807    		 737,277,952
    703    		 840,957,664
    801    		 681,984,000
    650    		 836,637,676
    797
    74 120 783,216,000
    747    		 681,984,000
    650    		 777,888,000
    742    		 681,984,000
    650    		 773,892,000
    738
    63 120 666,792,000
    636    		 580,608,000
    554    		 662,256,000
    632    		 580,608,000
    554    		 658,854,000
    628
    21 80 222,264,000
    212    		 193,536,000
    185    		 220,752,000
    211    		 193,536,000
    185    		 219,618,000
    209
    18 80 190,512,000
    182    		 165,888,000
    158    		 189,216,000
    180    		 165,888,000
    158    		 188,244,000
    180
    index


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