Device Information

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Newer (4th gen+) iPods expose data about themselves available through a SCSI INQUIRY command. The 0xC0 page code contains a list page codes for each chunk of the data. 

sg_inq -p=0xc0 /dev/sda
VPD INQUIRY, page code=0xc0:
 00     00 c0 00 27 c2 c3 c4 c5  c6 c7 c8 c9 ca cb cc cd    ...'............
 10     ce cf d0 d1 d2 d3 d4 d5  d6 d7 d8 d9 da db dc dd    ................
 20     de df e0 e1 e2 e3 e4 e5  e6 e7 e8                   ...........

The 2nd byte is just the page code you requested, and the 4th byte is the length of the payload. According to the above, the device data starts at page code 0xC2 and ends at 0xE8. You can request each chunk the same way as we did above: 

sg_inq -p=0xc2 /dev/sda
VPD INQUIRY, page code=0xc2:
 00     00 c2 00 f8 3c 3f 78 6d  6c 20 76 65 72 73 69 6f    ....<?xml versio
 10     6e 3d 22 31 2e 30 22 20  65 6e 63 6f 64 69 6e 67    n="1.0" encoding
 20     3d 22 55 54 46 2d 38 22  3f 3e 0a 3c 21 44 4f 43    ="UTF-8"?>.<!DOC
 30     54 59 50 45 20 70 6c 69  73 74 20 50 55 42 4c 49    TYPE plist PUBLI
 40     43 20 22 2d 2f 2f 41 70  70 6c 65 20 43 6f 6d 70    C "-//Apple Comp
 50     75 74 65 72 2f 2f 44 54  44 20 50 4c 49 53 54 20    uter//DTD PLIST
 60     31 2e 30 2f 2f 45 4e 22  20 22 68 74 74 70 3a 2f    1.0//EN" "http:/
 70     2f 77 77 77 2e 61 70 70  6c 65 2e 63 6f 6d 2f 44    /www.apple.com/D
 80     54 44 73 2f 50 72 6f 70  65 72 74 79 4c 69 73 74    TDs/PropertyList
 90     2d 31 2e 30 2e 64 74 64  22 3e 0a 3c 70 6c 69 73    -1.0.dtd">.<plis
 a0     74 20 76 65 72 73 69 6f  6e 3d 22 31 2e 30 22 3e    t version="1.0">
 b0     0a 3c 64 69 63 74 3e 0a  3c 6b 65 79 3e 41 70 70    .<dict>.<key>App
 c0     6c 65 44 52 4d 56 65 72  73 69 6f 6e 3c 2f 6b 65    leDRMVersion</ke
 d0     79 3e 0a 3c 64 69 63 74  3e 0a 3c 6b 65 79 3e 4d    y>.<dict>.<key>M
 e0     69 6e 69 6d 75 6d 3c 2f  6b 65 79 3e 0a 3c 69 6e    inimum</key>.<in
 f0     74 65 67 65 72 3e 30 3c  2f 69 6e 74                teger>0</int

As you can see, the data is an xml document. It contains nice things like the serial number and supported audio/photo/video formats. An example of a complete doc from a video iPod is below: 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>AppleDRMVersion</key>
    <dict>
      <key>Minimum</key>
      <integer>0</integer>
      <key>Maximum</key>
      <integer>4</integer>
      <key>Format</key>
      <integer>2</integer>
    </dict>
    <key>AudioCodecs</key>
    <dict>
      <key>AIFF</key>
      <dict>
        <key>Mono</key>
        <true/>
        <key>Stereo</key>
        <true/>
        <key>Multichannel</key>
        <false/>
        <key>MaximumSampleRate</key>
        <integer>48000</integer>
        <key>MaximumBitDepth</key>
        <integer>16</integer>
      </dict>
      <key>MP3</key>
      <dict>
        <key>Mono</key>
        <true/>
        <key>Stereo</key>
        <true/>
        <key>MaximumSampleRate</key>
        <integer>48000</integer>
        <key>MaximumDataRate</key>
        <integer>320</integer>
      </dict>
      <key>WAV</key>
      <dict>
        <key>Mono</key>
        <true/>
        <key>Stereo</key>
        <true/>
        <key>Multichannel</key>
        <false/>
        <key>MaximumSampleRate</key>
        <integer>48000</integer>
        <key>MaximumBitDepth</key>
        <integer>16</integer>
      </dict>
      <key>AAC</key>
      <dict>
        <key>AppleDRM</key>
        <true/>
        <key>MaximumSampleRate</key>
        <integer>48000</integer>
        <key>LC</key>
        <dict>
          <key>VariableBitRate</key>
          <true/>
          <key>PerceptualNoiseSubsitution</key>
          <true/>
        </dict>
      </dict>
      <key>AppleLossless</key>
      <dict>
        <key>Mono</key>
        <true/>
        <key>Stereo</key>
        <true/>
        <key>Multichannel</key>
        <false/>
        <key>MaximumBitDepth</key>
        <integer>32</integer>
        <key>MaximumBitDepthUntruncated</key>
        <integer>16</integer>
        <key>MaximumSampleRate</key>
        <integer>48000</integer>
        <key>AppleDRM</key>
        <true/>
      </dict>
      <key>Audible</key>
      <dict>
        <key>Type1</key>
        <false/>
        <key>Type2</key>
        <true/>
        <key>Type3</key>
        <true/>
        <key>Type4</key>
        <true/>
      </dict>
    </dict>
    <key>BuildID</key>
    <string>6.1.2</string>
    <key>ConnectedBus</key>
    <string>USB</string>
    <key>MaxTransferSpeed</key>
    <integer>61440</integer>
    <key>FamilyID</key>
    <integer>6</integer>
    <key>FireWireGUID</key>
    <string>000A2700157501F8</string>
    <key>FireWireVersion</key>
    <string>1.62</string>
    <key>ImageSpecifications</key>
    <array>
      <key>1019</key>
      <dict>
        <key>FormatId</key>
        <integer>1019</integer>
        <key>DisplayWidth</key>
        <integer>720</integer>
        <key>RenderWidth</key>
        <integer>640</integer>
        <key>RenderHeight</key>
        <integer>480</integer>
        <key>PixelFormat</key>
        <string>32767579</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>1</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <false/>
      </dict>
      <key>1015</key>
      <dict>
        <key>FormatId</key>
        <integer>1015</integer>
        <key>RenderWidth</key>
        <integer>130</integer>
        <key>RenderHeight</key>
        <integer>88</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>00000000</string>
      </dict>
      <key>1024</key>
      <dict>
        <key>FormatId</key>
        <integer>1024</integer>
        <key>RenderWidth</key>
        <integer>320</integer>
        <key>RenderHeight</key>
        <integer>240</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>Rotation</key>
        <integer>0</integer>
      </dict>
      <key>1036</key>
      <dict>
        <key>FormatId</key>
        <integer>1036</integer>
        <key>RenderWidth</key>
        <integer>50</integer>
        <key>RenderHeight</key>
        <integer>41</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <true/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>00000000</string>
      </dict>
    </array>
    <key>AlbumArt</key>
    <array>
      <key>1028</key>
      <dict>
        <key>FormatId</key>
        <integer>1028</integer>
        <key>RenderWidth</key>
        <integer>100</integer>
        <key>RenderHeight</key>
        <integer>100</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>FFFFFFFF</string>
      </dict>
      <key>1029</key>
      <dict>
        <key>FormatId</key>
        <integer>1029</integer>
        <key>RenderWidth</key>
        <integer>200</integer>
        <key>RenderHeight</key>
        <integer>200</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>FFFFFFFF</string>
      </dict>
    </array>
    <key>PodcastsSupported</key>
    <true/>
    <key>ChapterImageSpecs</key>
    <array>
      <key>1028</key>
      <dict>
        <key>FormatId</key>
        <integer>1028</integer>
        <key>RenderWidth</key>
        <integer>100</integer>
        <key>RenderHeight</key>
        <integer>100</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>FFFFFFFF</string>
      </dict>
      <key>1029</key>
      <dict>
        <key>FormatId</key>
        <integer>1029</integer>
        <key>RenderWidth</key>
        <integer>200</integer>
        <key>RenderHeight</key>
        <integer>200</integer>
        <key>PixelFormat</key>
        <string>4C353635</string>
        <key>Interlaced</key>
        <false/>
        <key>ColorAdjustment</key>
        <integer>0</integer>
        <key>GammaAdjustment</key>
        <real>2.2</real>
        <key>Crop</key>
        <false/>
        <key>AlignRowBytes</key>
        <true/>
        <key>BackColor</key>
        <string>FFFFFFFF</string>
      </dict>
    </array>
    <key>MinITunesVersion</key>
    <string>6.0</string>
    <key>SerialNumber</key>
    <string>XXXXXXXXXXX</string>
    <key>UpdaterFamilyID</key>
    <integer>13</integer>
    <key>VisibleBuildID</key>
    <string>1.1.2</string>
    <key>64Bit</key>
    <integer>3</integer>
    <key>OEMID</key>
    <integer>0</integer>
    <key>OEMV</key>
    <integer>8</integer>
    <key>PowerInformation</key>
    <dict>
      <key>WillFlash</key>
      <true/>
      <key>USB</key>
      <true/>
      <key>FireWire</key>
      <false/>
    </dict>
    <key>VoiceMemosSupported</key>
    <true/>
    <key>VoiceMemoFormats</key>
    <dict>
      <key>WAV</key>
      <dict>
        <key>MaximumSampleRate</key>
        <integer>44100</integer>
      </dict>
    </dict>
    <key>AutoRebootAfterFirmwareUpdate</key>
    <true/>
    <key>VolumeFormat</key>
    <string>FAT32</string>
    <key>VolumeInformation</key>
    <dict>
      <key>HFSPLUS</key>
      <dict>
        <key>SupportedFormat</key>
        <true/>
        <key>ConversionSupported</key>
        <true/>
        <key>CurrentFormat</key>
        <false/>
      </dict>
      <key>FAT32</key>
      <dict>
        <key>SupportedFormat</key>
        <true/>
        <key>ConversionSupported</key>
        <false/>
        <key>CurrentFormat</key>
        <true/>
      </dict>
    </dict>
    <key>ForcedDiskMode</key>
    <false/>
    <key>BangFolder</key>
    <false/>
    <key>CorruptDataPartition</key>
    <false/>
    <key>CorruptFirmwarePartition</key>
    <false/>
    <key>CanFlashBacklight</key>
    <true/>
    <key>CanHibernate</key>
    <true/>
    <key>RAM</key>
    <integer>32</integer>
    <key>HotPlugState</key>
    <integer>0</integer>
    <key>vCardWithJPEGSupported</key>
    <true/>
    <key>VideoCodecs</key>
    <dict>
      <key>H.264</key>
      <dict>
        <key>AppleVideoDRM</key>
        <dict>
          <key>MaximumEncryptionPercentage</key>
          <real>12.5</real>
        </dict>
        <key>AAC</key>
        <dict>
          <key>AppleDRM</key>
          <true/>
          <key>MaximumSampleRate</key>
          <integer>48000</integer>
          <key>MaximumBitRate</key>
          <integer>160</integer>
          <key>LC</key>
          <dict>
            <key>VariableBitRate</key>
            <true/>
            <key>Multichannel</key>
            <false/>
          </dict>
        </dict>
        <key>Profile</key>
        <string>B</string>
        <key>Level</key>
        <integer>13</integer>
        <key>MaximumPeakBitRate</key>
        <integer>768</integer>
        <key>MaximumResolution</key>
        <integer>76800</integer>
        <key>MinimumWidth</key>
        <integer>16</integer>
        <key>MinimumHeight</key>
        <integer>16</integer>
        <key>MaximumWidth</key>
        <integer>4800</integer>
        <key>MaximumHeight</key>
        <integer>4800</integer>
      </dict>
      <key>MPEG4</key>
      <dict>
        <key>AppleVideoDRM</key>
        <dict>
          <key>MaximumEncryptionPercentage</key>
          <real>12.5</real>
        </dict>
        <key>AAC</key>
        <dict>
          <key>AppleDRM</key>
          <true/>
          <key>MaximumSampleRate</key>
          <integer>48000</integer>
          <key>MaximumBitRate</key>
          <integer>160</integer>
          <key>LC</key>
          <dict>
            <key>VariableBitRate</key>
            <true/>
            <key>Multichannel</key>
            <false/>
          </dict>
        </dict>
        <key>Profile-Level-ID</key>
        <integer>3</integer>
        <key>MaximumAverageBitRate</key>
        <integer>2500</integer>
        <key>MaximumPeakBitRate</key>
        <integer>0</integer>
        <key>MaximumBufferSize</key>
        <integer>0</integer>
        <key>MaximumResolution</key>
        <integer>230400</integer>
        <key>MinimumWidth</key>
        <integer>16</integer>
        <key>MinimumHeight</key>
        <integer>16</integer>
        <key>MaximumWidth</key>
        <integer>14400</integer>
        <key>MaximumHeight</key>
        <integer>14400</integer>
      </dict>
    </dict>
  </dict>
</plist>
Retrieved from "http://ipodlinux.org/wiki/Device_Information"