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Friends, I am a complete noob to the Linux world. I just installed 12.04 LTS version. Everything is working fine and I love it. There is one small problem. I insert my DVD into the optical drive. The disk is spinning. However, I am not able to see the device mounting. The Optical drive is not listed under the Devices tab in Nautilus. I went through similar questions and thus, ran the dmesg | grep sr0

This is my result --

[  811.126153] sr 1:0:0:0: [sr0]  
[  811.126159] sr 1:0:0:0: [sr0] CDB: 
[  811.126171] end_request: I/O error, dev sr0, sector 64
[  811.126176] Buffer I/O error on device sr0, logical block 8
[  819.714191] sr 1:0:0:0: [sr0] Unhandled sense code
[  819.714197] sr 1:0:0:0: [sr0]  
[  819.714202] sr 1:0:0:0: [sr0]  
[  819.714208] sr 1:0:0:0: [sr0]  
[  819.714214] sr 1:0:0:0: [sr0] CDB: 
[  819.714225] end_request: I/O error, dev sr0, sector 64
[  819.714229] Buffer I/O error on device sr0, logical block 8
[  828.302248] sr 1:0:0:0: [sr0] Unhandled sense code
[  828.302253] sr 1:0:0:0: [sr0]  
[  828.302257] sr 1:0:0:0: [sr0]  
[  828.302263] sr 1:0:0:0: [sr0]  
[  828.302270] sr 1:0:0:0: [sr0] CDB: 
[  828.302281] end_request: I/O error, dev sr0, sector 64
[  828.302285] Buffer I/O error on device sr0, logical block 8
[  836.890310] sr 1:0:0:0: [sr0] Unhandled sense code
[  836.890316] sr 1:0:0:0: [sr0]  
[  836.890321] sr 1:0:0:0: [sr0]  
[  836.890327] sr 1:0:0:0: [sr0]  
[  836.890333] sr 1:0:0:0: [sr0] CDB: 
[  836.890345] end_request: I/O error, dev sr0, sector 64
[  836.890350] Buffer I/O error on device sr0, logical block 8
[  845.478334] sr 1:0:0:0: [sr0] Unhandled sense code
[  845.478339] sr 1:0:0:0: [sr0]  
[  845.478343] sr 1:0:0:0: [sr0]  
[  845.478349] sr 1:0:0:0: [sr0]  
[  845.478355] sr 1:0:0:0: [sr0] CDB: 
[  845.478366] end_request: I/O error, dev sr0, sector 64
[  845.478370] Buffer I/O error on device sr0, logical block 8
[  854.066484] sr 1:0:0:0: [sr0] Unhandled sense code
[  854.066496] sr 1:0:0:0: [sr0]  
[  854.066502] sr 1:0:0:0: [sr0]  
[  854.066508] sr 1:0:0:0: [sr0]  
[  854.066515] sr 1:0:0:0: [sr0] CDB: 
[  854.066528] end_request: I/O error, dev sr0, sector 64
[  854.066534] Buffer I/O error on device sr0, logical block 8
[  862.654420] sr 1:0:0:0: [sr0] Unhandled sense code
[  862.654426] sr 1:0:0:0: [sr0]  
[  862.654430] sr 1:0:0:0: [sr0]  
[  862.654436] sr 1:0:0:0: [sr0]  
[  862.654442] sr 1:0:0:0: [sr0] CDB: 
[  862.654453] end_request: I/O error, dev sr0, sector 64
[  862.654458] Buffer I/O error on device sr0, logical block 8
[  871.242441] sr 1:0:0:0: [sr0] Unhandled sense code
[  871.242446] sr 1:0:0:0: [sr0]  
[  871.242451] sr 1:0:0:0: [sr0]  
[  871.242457] sr 1:0:0:0: [sr0]  
[  871.242463] sr 1:0:0:0: [sr0] CDB: 
[  871.242474] end_request: I/O error, dev sr0, sector 64
[  871.242478] Buffer I/O error on device sr0, logical block 8
[  879.830551] sr 1:0:0:0: [sr0] Unhandled sense code
[  879.830558] sr 1:0:0:0: [sr0]  
[  879.830563] sr 1:0:0:0: [sr0]  
[  879.830570] sr 1:0:0:0: [sr0]  
[  879.830578] sr 1:0:0:0: [sr0] CDB: 
[  879.830590] end_request: I/O error, dev sr0, sector 64
[  879.830596] Buffer I/O error on device sr0, logical block 8
[  888.418535] sr 1:0:0:0: [sr0] Unhandled sense code
[  888.418541] sr 1:0:0:0: [sr0]  
[  888.418546] sr 1:0:0:0: [sr0]  
[  888.418552] sr 1:0:0:0: [sr0]  
[  888.418558] sr 1:0:0:0: [sr0] CDB: 
[  888.418570] end_request: I/O error, dev sr0, sector 64
[  888.418574] Buffer I/O error on device sr0, logical block 8
[  897.006561] sr 1:0:0:0: [sr0] Unhandled sense code
[  897.006566] sr 1:0:0:0: [sr0]  
[  897.006572] sr 1:0:0:0: [sr0]  
[  897.006578] sr 1:0:0:0: [sr0]  
[  897.006585] sr 1:0:0:0: [sr0] CDB: 
[  897.006597] end_request: I/O error, dev sr0, sector 0
[  897.006601] Buffer I/O error on device sr0, logical block 0
[  905.594581] sr 1:0:0:0: [sr0] Unhandled sense code
[  905.594586] sr 1:0:0:0: [sr0]  
[  905.594591] sr 1:0:0:0: [sr0]  
[  905.594597] sr 1:0:0:0: [sr0]  
[  905.594602] sr 1:0:0:0: [sr0] CDB: 
[  905.594614] end_request: I/O error, dev sr0, sector 0
[  905.594618] Buffer I/O error on device sr0, logical block 0
[  914.182609] sr 1:0:0:0: [sr0] Unhandled sense code
[  914.182615] sr 1:0:0:0: [sr0]  
[  914.182620] sr 1:0:0:0: [sr0]  
[  914.182625] sr 1:0:0:0: [sr0]  
[  914.182631] sr 1:0:0:0: [sr0] CDB: 
[  914.182642] end_request: I/O error, dev sr0, sector 0
[  914.182647] Buffer I/O error on device sr0, logical block 0
[  922.770635] sr 1:0:0:0: [sr0] Unhandled sense code
[  922.770640] sr 1:0:0:0: [sr0]  
[  922.770645] sr 1:0:0:0: [sr0]  
[  922.770650] sr 1:0:0:0: [sr0]  
[  922.770656] sr 1:0:0:0: [sr0] CDB: 
[  922.770668] end_request: I/O error, dev sr0, sector 0
[  922.770672] Buffer I/O error on device sr0, logical block 0
[  931.380074] sr 1:0:0:0: [sr0] Unhandled sense code
[  931.380079] sr 1:0:0:0: [sr0]  
[  931.380083] sr 1:0:0:0: [sr0]  
[  931.380089] sr 1:0:0:0: [sr0]  
[  931.380095] sr 1:0:0:0: [sr0] CDB: 
[  931.380107] end_request: I/O error, dev sr0, sector 0
[  931.380111] Buffer I/O error on device sr0, logical block 0
[  939.968097] sr 1:0:0:0: [sr0] Unhandled sense code
[  939.968102] sr 1:0:0:0: [sr0]  
[  939.968107] sr 1:0:0:0: [sr0]  
[  939.968113] sr 1:0:0:0: [sr0]  
[  939.968119] sr 1:0:0:0: [sr0] CDB: 
[  939.968130] end_request: I/O error, dev sr0, sector 16
[  939.968134] Buffer I/O error on device sr0, logical block 2
[  948.556131] sr 1:0:0:0: [sr0] Unhandled sense code
[  948.556136] sr 1:0:0:0: [sr0]  
[  948.556141] sr 1:0:0:0: [sr0]  
[  948.556147] sr 1:0:0:0: [sr0]  
[  948.556153] sr 1:0:0:0: [sr0] CDB: 
[  948.556164] end_request: I/O error, dev sr0, sector 0
[  948.556169] Buffer I/O error on device sr0, logical block 0
[  957.144184] sr 1:0:0:0: [sr0] Unhandled sense code
[  957.144190] sr 1:0:0:0: [sr0]  
[  957.144195] sr 1:0:0:0: [sr0]  
[  957.144201] sr 1:0:0:0: [sr0]  
[  957.144209] sr 1:0:0:0: [sr0] CDB: 
[  957.144220] end_request: I/O error, dev sr0, sector 0
[  957.144226] Buffer I/O error on device sr0, logical block 0
[  965.732168] sr 1:0:0:0: [sr0] Unhandled sense code
[  965.732173] sr 1:0:0:0: [sr0]  
[  965.732177] sr 1:0:0:0: [sr0]  
[  965.732183] sr 1:0:0:0: [sr0]  
[  965.732190] sr 1:0:0:0: [sr0] CDB: 
[  965.732202] end_request: I/O error, dev sr0, sector 0
[  965.732206] Buffer I/O error on device sr0, logical block 0
[  974.320188] sr 1:0:0:0: [sr0] Unhandled sense code
[  974.320192] sr 1:0:0:0: [sr0]  
[  974.320197] sr 1:0:0:0: [sr0]  
[  974.320203] sr 1:0:0:0: [sr0]  
[  974.320209] sr 1:0:0:0: [sr0] CDB: 
[  974.320221] end_request: I/O error, dev sr0, sector 0
[  974.320225] Buffer I/O error on device sr0, logical block 0
[  982.908222] sr 1:0:0:0: [sr0] Unhandled sense code
[  982.908227] sr 1:0:0:0: [sr0]  
[  982.908232] sr 1:0:0:0: [sr0]  
[  982.908239] sr 1:0:0:0: [sr0]  
[  982.908245] sr 1:0:0:0: [sr0] CDB: 
[  982.908256] end_request: I/O error, dev sr0, sector 0
[  982.908262] Buffer I/O error on device sr0, logical block 0
[  991.496212] sr 1:0:0:0: [sr0] Unhandled sense code
[  991.496217] sr 1:0:0:0: [sr0]  
[  991.496222] sr 1:0:0:0: [sr0]  
[  991.496227] sr 1:0:0:0: [sr0]  
[  991.496234] sr 1:0:0:0: [sr0] CDB: 
[  991.496246] end_request: I/O error, dev sr0, sector 0
[  991.496250] Buffer I/O error on device sr0, logical block 0
[ 1000.084220] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1000.084226] sr 1:0:0:0: [sr0]  
[ 1000.084230] sr 1:0:0:0: [sr0]  
[ 1000.084237] sr 1:0:0:0: [sr0]  
[ 1000.084243] sr 1:0:0:0: [sr0] CDB: 
[ 1000.084254] end_request: I/O error, dev sr0, sector 0
[ 1000.084260] Buffer I/O error on device sr0, logical block 0
[ 1008.672232] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1008.672237] sr 1:0:0:0: [sr0]  
[ 1008.672241] sr 1:0:0:0: [sr0]  
[ 1008.672247] sr 1:0:0:0: [sr0]  
[ 1008.672253] sr 1:0:0:0: [sr0] CDB: 
[ 1008.672265] end_request: I/O error, dev sr0, sector 0
[ 1008.672269] Buffer I/O error on device sr0, logical block 0
[ 1017.260236] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1017.260240] sr 1:0:0:0: [sr0]  
[ 1017.260245] sr 1:0:0:0: [sr0]  
[ 1017.260251] sr 1:0:0:0: [sr0]  
[ 1017.260257] sr 1:0:0:0: [sr0] CDB: 
[ 1017.260268] end_request: I/O error, dev sr0, sector 0
[ 1017.260272] Buffer I/O error on device sr0, logical block 0
[ 1025.848243] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1025.848248] sr 1:0:0:0: [sr0]  
[ 1025.848253] sr 1:0:0:0: [sr0]  
[ 1025.848259] sr 1:0:0:0: [sr0]  
[ 1025.848265] sr 1:0:0:0: [sr0] CDB: 
[ 1025.848276] end_request: I/O error, dev sr0, sector 0
[ 1025.848281] Buffer I/O error on device sr0, logical block 0
[ 1034.436268] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1034.436273] sr 1:0:0:0: [sr0]  
[ 1034.436278] sr 1:0:0:0: [sr0]  
[ 1034.436284] sr 1:0:0:0: [sr0]  
[ 1034.436290] sr 1:0:0:0: [sr0] CDB: 
[ 1034.436302] end_request: I/O error, dev sr0, sector 0
[ 1034.436306] Buffer I/O error on device sr0, logical block 0
[ 1043.024276] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1043.024281] sr 1:0:0:0: [sr0]  
[ 1043.024285] sr 1:0:0:0: [sr0]  
[ 1043.024291] sr 1:0:0:0: [sr0]  
[ 1043.024297] sr 1:0:0:0: [sr0] CDB: 
[ 1043.024308] end_request: I/O error, dev sr0, sector 0
[ 1043.024313] Buffer I/O error on device sr0, logical block 0
[ 1051.612285] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1051.612289] sr 1:0:0:0: [sr0]  
[ 1051.612294] sr 1:0:0:0: [sr0]  
[ 1051.612299] sr 1:0:0:0: [sr0]  
[ 1051.612306] sr 1:0:0:0: [sr0] CDB: 
[ 1051.612317] end_request: I/O error, dev sr0, sector 128
[ 1051.612321] Buffer I/O error on device sr0, logical block 16
[ 1060.200273] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1060.200278] sr 1:0:0:0: [sr0]  
[ 1060.200282] sr 1:0:0:0: [sr0]  
[ 1060.200289] sr 1:0:0:0: [sr0]  
[ 1060.200295] sr 1:0:0:0: [sr0] CDB: 
[ 1060.200306] end_request: I/O error, dev sr0, sector 128
[ 1060.200311] Buffer I/O error on device sr0, logical block 16
[ 1068.788284] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1068.788288] sr 1:0:0:0: [sr0]  
[ 1068.788293] sr 1:0:0:0: [sr0]  
[ 1068.788299] sr 1:0:0:0: [sr0]  
[ 1068.788305] sr 1:0:0:0: [sr0] CDB: 
[ 1068.788316] end_request: I/O error, dev sr0, sector 16
[ 1068.788325] Buffer I/O error on device sr0, logical block 2
[ 1077.376314] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1077.376321] sr 1:0:0:0: [sr0]  
[ 1077.376333] sr 1:0:0:0: [sr0]  
[ 1077.376339] sr 1:0:0:0: [sr0]  
[ 1077.376345] sr 1:0:0:0: [sr0] CDB: 
[ 1077.376356] end_request: I/O error, dev sr0, sector 0
[ 1077.376360] Buffer I/O error on device sr0, logical block 0
[ 1085.964304] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1085.964310] sr 1:0:0:0: [sr0]  
[ 1085.964315] sr 1:0:0:0: [sr0]  
[ 1085.964321] sr 1:0:0:0: [sr0]  
[ 1085.964328] sr 1:0:0:0: [sr0] CDB: 
[ 1085.964340] end_request: I/O error, dev sr0, sector 0
[ 1085.964345] Buffer I/O error on device sr0, logical block 0
[ 1094.552278] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1094.552284] sr 1:0:0:0: [sr0]  
[ 1094.552289] sr 1:0:0:0: [sr0]  
[ 1094.552295] sr 1:0:0:0: [sr0]  
[ 1094.552302] sr 1:0:0:0: [sr0] CDB: 
[ 1094.552313] end_request: I/O error, dev sr0, sector 8
[ 1094.552318] Buffer I/O error on device sr0, logical block 1
[ 1103.140271] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1103.140276] sr 1:0:0:0: [sr0]  
[ 1103.140281] sr 1:0:0:0: [sr0]  
[ 1103.140286] sr 1:0:0:0: [sr0]  
[ 1103.140292] sr 1:0:0:0: [sr0] CDB: 
[ 1103.140303] end_request: I/O error, dev sr0, sector 16
[ 1103.140308] Buffer I/O error on device sr0, logical block 2
[ 1111.728281] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1111.728286] sr 1:0:0:0: [sr0]  
[ 1111.728291] sr 1:0:0:0: [sr0]  
[ 1111.728296] sr 1:0:0:0: [sr0]  
[ 1111.728303] sr 1:0:0:0: [sr0] CDB: 
[ 1111.728315] end_request: I/O error, dev sr0, sector 0
[ 1111.728319] Buffer I/O error on device sr0, logical block 0
[ 1120.316269] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1120.316275] sr 1:0:0:0: [sr0]  
[ 1120.316280] sr 1:0:0:0: [sr0]  
[ 1120.316285] sr 1:0:0:0: [sr0]  
[ 1120.316291] sr 1:0:0:0: [sr0] CDB: 
[ 1120.316302] end_request: I/O error, dev sr0, sector 0
[ 1120.316307] Buffer I/O error on device sr0, logical block 0
[ 1128.904289] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1128.904297] sr 1:0:0:0: [sr0]  
[ 1128.904308] sr 1:0:0:0: [sr0]  
[ 1128.904314] sr 1:0:0:0: [sr0]  
[ 1128.904320] sr 1:0:0:0: [sr0] CDB: 
[ 1128.904332] end_request: I/O error, dev sr0, sector 0
[ 1128.904336] Buffer I/O error on device sr0, logical block 0
[ 1137.492229] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1137.492234] sr 1:0:0:0: [sr0]  
[ 1137.492238] sr 1:0:0:0: [sr0]  
[ 1137.492245] sr 1:0:0:0: [sr0]  
[ 1137.492251] sr 1:0:0:0: [sr0] CDB: 
[ 1137.492262] end_request: I/O error, dev sr0, sector 0
[ 1137.492267] Buffer I/O error on device sr0, logical block 0
[ 1146.080252] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1146.080257] sr 1:0:0:0: [sr0]  
[ 1146.080261] sr 1:0:0:0: [sr0]  
[ 1146.080267] sr 1:0:0:0: [sr0]  
[ 1146.080273] sr 1:0:0:0: [sr0] CDB: 
[ 1146.080285] end_request: I/O error, dev sr0, sector 0
[ 1146.080289] Buffer I/O error on device sr0, logical block 0
[ 1154.668235] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1154.668239] sr 1:0:0:0: [sr0]  
[ 1154.668244] sr 1:0:0:0: [sr0]  
[ 1154.668250] sr 1:0:0:0: [sr0]  
[ 1154.668256] sr 1:0:0:0: [sr0] CDB: 
[ 1154.668268] end_request: I/O error, dev sr0, sector 0
[ 1154.668273] Buffer I/O error on device sr0, logical block 0
[ 1163.256207] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1163.256213] sr 1:0:0:0: [sr0]  
[ 1163.256218] sr 1:0:0:0: [sr0]  
[ 1163.256223] sr 1:0:0:0: [sr0]  
[ 1163.256229] sr 1:0:0:0: [sr0] CDB: 
[ 1163.256241] end_request: I/O error, dev sr0, sector 8
[ 1163.256245] Buffer I/O error on device sr0, logical block 1
[ 1171.844209] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1171.844214] sr 1:0:0:0: [sr0]  
[ 1171.844219] sr 1:0:0:0: [sr0]  
[ 1171.844225] sr 1:0:0:0: [sr0]  
[ 1171.844231] sr 1:0:0:0: [sr0] CDB: 
[ 1171.844243] end_request: I/O error, dev sr0, sector 128
[ 1171.844247] Buffer I/O error on device sr0, logical block 16
[ 1180.432176] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1180.432181] sr 1:0:0:0: [sr0]  
[ 1180.432186] sr 1:0:0:0: [sr0]  
[ 1180.432192] sr 1:0:0:0: [sr0]  
[ 1180.432198] sr 1:0:0:0: [sr0] CDB: 
[ 1180.432209] end_request: I/O error, dev sr0, sector 0
[ 1180.432214] Buffer I/O error on device sr0, logical block 0
[ 1189.020194] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1189.020207] sr 1:0:0:0: [sr0]  
[ 1189.020211] sr 1:0:0:0: [sr0]  
[ 1189.020217] sr 1:0:0:0: [sr0]  
[ 1189.020223] sr 1:0:0:0: [sr0] CDB: 
[ 1189.020234] end_request: I/O error, dev sr0, sector 0
[ 1189.020238] Buffer I/O error on device sr0, logical block 0
[ 1197.608157] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1197.608170] sr 1:0:0:0: [sr0]  
[ 1197.608175] sr 1:0:0:0: [sr0]  
[ 1197.608181] sr 1:0:0:0: [sr0]  
[ 1197.608187] sr 1:0:0:0: [sr0] CDB: 
[ 1197.608199] end_request: I/O error, dev sr0, sector 4096
[ 1197.608203] Buffer I/O error on device sr0, logical block 512
[ 1206.196117] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1206.196122] sr 1:0:0:0: [sr0]  
[ 1206.196127] sr 1:0:0:0: [sr0]  
[ 1206.196133] sr 1:0:0:0: [sr0]  
[ 1206.196139] sr 1:0:0:0: [sr0] CDB: 
[ 1206.196151] end_request: I/O error, dev sr0, sector 0
[ 1206.196155] Buffer I/O error on device sr0, logical block 0
[ 1214.784092] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1214.784097] sr 1:0:0:0: [sr0]  
[ 1214.784101] sr 1:0:0:0: [sr0]  
[ 1214.784108] sr 1:0:0:0: [sr0]  
[ 1214.784114] sr 1:0:0:0: [sr0] CDB: 
[ 1214.784125] end_request: I/O error, dev sr0, sector 0
[ 1214.784130] Buffer I/O error on device sr0, logical block 0
[ 1223.372078] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1223.372083] sr 1:0:0:0: [sr0]  
[ 1223.372087] sr 1:0:0:0: [sr0]  
[ 1223.372093] sr 1:0:0:0: [sr0]  
[ 1223.372100] sr 1:0:0:0: [sr0] CDB: 
[ 1223.372112] end_request: I/O error, dev sr0, sector 0
[ 1223.372116] Buffer I/O error on device sr0, logical block 0
[ 1231.960048] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1231.960053] sr 1:0:0:0: [sr0]  
[ 1231.960058] sr 1:0:0:0: [sr0]  
[ 1231.960064] sr 1:0:0:0: [sr0]  
[ 1231.960070] sr 1:0:0:0: [sr0] CDB: 
[ 1231.960081] end_request: I/O error, dev sr0, sector 0
[ 1231.960085] Buffer I/O error on device sr0, logical block 0
[ 1240.549983] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1240.549988] sr 1:0:0:0: [sr0]  
[ 1240.549992] sr 1:0:0:0: [sr0]  
[ 1240.549998] sr 1:0:0:0: [sr0]  
[ 1240.550004] sr 1:0:0:0: [sr0] CDB: 
[ 1240.550016] end_request: I/O error, dev sr0, sector 0
[ 1240.550020] Buffer I/O error on device sr0, logical block 0
[ 1249.137941] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1249.137948] sr 1:0:0:0: [sr0]  
[ 1249.137952] sr 1:0:0:0: [sr0]  
[ 1249.137959] sr 1:0:0:0: [sr0]  
[ 1249.137965] sr 1:0:0:0: [sr0] CDB: 
[ 1249.137977] end_request: I/O error, dev sr0, sector 0
[ 1249.137981] Buffer I/O error on device sr0, logical block 0
[ 1404.773262] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1404.773270] sr 1:0:0:0: [sr0]  
[ 1404.773278] sr 1:0:0:0: [sr0]  
[ 1404.773291] sr 1:0:0:0: [sr0]  
[ 1404.773297] sr 1:0:0:0: [sr0] CDB: 
[ 1404.773308] end_request: I/O error, dev sr0, sector 0
[ 1404.773312] Buffer I/O error on device sr0, logical block 0
[ 1404.773320] Buffer I/O error on device sr0, logical block 1
[ 1404.773323] Buffer I/O error on device sr0, logical block 2
[ 1404.773325] Buffer I/O error on device sr0, logical block 3
[ 1413.361334] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1413.361339] sr 1:0:0:0: [sr0]  
[ 1413.361343] sr 1:0:0:0: [sr0]  
[ 1413.361349] sr 1:0:0:0: [sr0]  
[ 1413.361355] sr 1:0:0:0: [sr0] CDB: 
[ 1413.361367] end_request: I/O error, dev sr0, sector 0
[ 1413.361371] Buffer I/O error on device sr0, logical block 0
[ 1421.949408] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1421.949412] sr 1:0:0:0: [sr0]  
[ 1421.949417] sr 1:0:0:0: [sr0]  
[ 1421.949423] sr 1:0:0:0: [sr0]  
[ 1421.949429] sr 1:0:0:0: [sr0] CDB: 
[ 1421.949440] end_request: I/O error, dev sr0, sector 0
[ 1421.949445] Buffer I/O error on device sr0, logical block 0
[ 1430.537453] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1430.537458] sr 1:0:0:0: [sr0]  
[ 1430.537463] sr 1:0:0:0: [sr0]  
[ 1430.537468] sr 1:0:0:0: [sr0]  
[ 1430.537474] sr 1:0:0:0: [sr0] CDB: 
[ 1430.537486] end_request: I/O error, dev sr0, sector 0
[ 1430.537490] Buffer I/O error on device sr0, logical block 0
[ 1439.127436] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1439.127442] sr 1:0:0:0: [sr0]  
[ 1439.127446] sr 1:0:0:0: [sr0]  
[ 1439.127452] sr 1:0:0:0: [sr0]  
[ 1439.127458] sr 1:0:0:0: [sr0] CDB: 
[ 1439.127469] end_request: I/O error, dev sr0, sector 0
[ 1439.127473] Buffer I/O error on device sr0, logical block 0
[ 1447.715449] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1447.715454] sr 1:0:0:0: [sr0]  
[ 1447.715458] sr 1:0:0:0: [sr0]  
[ 1447.715465] sr 1:0:0:0: [sr0]  
[ 1447.715471] sr 1:0:0:0: [sr0] CDB: 
[ 1447.715482] end_request: I/O error, dev sr0, sector 0
[ 1447.715486] Buffer I/O error on device sr0, logical block 0
[ 1456.303502] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1456.303509] sr 1:0:0:0: [sr0]  
[ 1456.303521] sr 1:0:0:0: [sr0]  
[ 1456.303527] sr 1:0:0:0: [sr0]  
[ 1456.303533] sr 1:0:0:0: [sr0] CDB: 
[ 1456.303544] end_request: I/O error, dev sr0, sector 0
[ 1456.303548] Buffer I/O error on device sr0, logical block 0
[ 1464.891481] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1464.891486] sr 1:0:0:0: [sr0]  
[ 1464.891491] sr 1:0:0:0: [sr0]  
[ 1464.891497] sr 1:0:0:0: [sr0]  
[ 1464.891503] sr 1:0:0:0: [sr0] CDB: 
[ 1464.891514] end_request: I/O error, dev sr0, sector 0
[ 1464.891518] Buffer I/O error on device sr0, logical block 0
[ 1473.479482] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1473.479486] sr 1:0:0:0: [sr0]  
[ 1473.479491] sr 1:0:0:0: [sr0]  
[ 1473.479497] sr 1:0:0:0: [sr0]  
[ 1473.479503] sr 1:0:0:0: [sr0] CDB: 
[ 1473.479514] end_request: I/O error, dev sr0, sector 0
[ 1473.479519] Buffer I/O error on device sr0, logical block 0
[ 1482.067463] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1482.067470] sr 1:0:0:0: [sr0]  
[ 1482.067478] sr 1:0:0:0: [sr0]  
[ 1482.067492] sr 1:0:0:0: [sr0]  
[ 1482.067498] sr 1:0:0:0: [sr0] CDB: 
[ 1482.067509] end_request: I/O error, dev sr0, sector 128
[ 1482.067513] Buffer I/O error on device sr0, logical block 16
[ 1490.655460] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1490.655465] sr 1:0:0:0: [sr0]  
[ 1490.655470] sr 1:0:0:0: [sr0]  
[ 1490.655476] sr 1:0:0:0: [sr0]  
[ 1490.655482] sr 1:0:0:0: [sr0] CDB: 
[ 1490.655493] end_request: I/O error, dev sr0, sector 0
[ 1490.655497] Buffer I/O error on device sr0, logical block 0
[ 1499.243444] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1499.243451] sr 1:0:0:0: [sr0]  
[ 1499.243460] sr 1:0:0:0: [sr0]  
[ 1499.243472] sr 1:0:0:0: [sr0]  
[ 1499.243479] sr 1:0:0:0: [sr0] CDB: 
[ 1499.243490] end_request: I/O error, dev sr0, sector 0
[ 1499.243494] Buffer I/O error on device sr0, logical block 0
[ 1672.795123] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1672.795128] sr 1:0:0:0: [sr0]  
[ 1672.795134] sr 1:0:0:0: [sr0]  
[ 1672.795139] sr 1:0:0:0: [sr0]  
[ 1672.795145] sr 1:0:0:0: [sr0] CDB: 
[ 1672.795156] end_request: I/O error, dev sr0, sector 0
[ 1672.795161] Buffer I/O error on device sr0, logical block 0
[ 1681.383144] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1681.383149] sr 1:0:0:0: [sr0]  
[ 1681.383154] sr 1:0:0:0: [sr0]  
[ 1681.383159] sr 1:0:0:0: [sr0]  
[ 1681.383165] sr 1:0:0:0: [sr0] CDB: 
[ 1681.383176] end_request: I/O error, dev sr0, sector 0
[ 1681.383180] Buffer I/O error on device sr0, logical block 0
[ 1689.971212] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1689.971217] sr 1:0:0:0: [sr0]  
[ 1689.971221] sr 1:0:0:0: [sr0]  
[ 1689.971227] sr 1:0:0:0: [sr0]  
[ 1689.971233] sr 1:0:0:0: [sr0] CDB: 
[ 1689.971244] end_request: I/O error, dev sr0, sector 0
[ 1689.971248] Buffer I/O error on device sr0, logical block 0
[ 1698.559260] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1698.559265] sr 1:0:0:0: [sr0]  
[ 1698.559270] sr 1:0:0:0: [sr0]  
[ 1698.559276] sr 1:0:0:0: [sr0]  
[ 1698.559282] sr 1:0:0:0: [sr0] CDB: 
[ 1698.559293] end_request: I/O error, dev sr0, sector 0
[ 1698.559297] Buffer I/O error on device sr0, logical block 0
[ 1707.147279] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1707.147284] sr 1:0:0:0: [sr0]  
[ 1707.147289] sr 1:0:0:0: [sr0]  
[ 1707.147295] sr 1:0:0:0: [sr0]  
[ 1707.147302] sr 1:0:0:0: [sr0] CDB: 
[ 1707.147313] end_request: I/O error, dev sr0, sector 0
[ 1707.147318] Buffer I/O error on device sr0, logical block 0
[ 1715.735287] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1715.735293] sr 1:0:0:0: [sr0]  
[ 1715.735298] sr 1:0:0:0: [sr0]  
[ 1715.735304] sr 1:0:0:0: [sr0]  
[ 1715.735311] sr 1:0:0:0: [sr0] CDB: 
[ 1715.735323] end_request: I/O error, dev sr0, sector 0
[ 1715.735327] Buffer I/O error on device sr0, logical block 0
[ 1724.323338] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1724.323343] sr 1:0:0:0: [sr0]  
[ 1724.323348] sr 1:0:0:0: [sr0]  
[ 1724.323354] sr 1:0:0:0: [sr0]  
[ 1724.323360] sr 1:0:0:0: [sr0] CDB: 
[ 1724.323371] end_request: I/O error, dev sr0, sector 0
[ 1724.323375] Buffer I/O error on device sr0, logical block 0
[ 1732.911352] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1732.911357] sr 1:0:0:0: [sr0]  
[ 1732.911361] sr 1:0:0:0: [sr0]  
[ 1732.911368] sr 1:0:0:0: [sr0]  
[ 1732.911374] sr 1:0:0:0: [sr0] CDB: 
[ 1732.911385] end_request: I/O error, dev sr0, sector 0
[ 1732.911390] Buffer I/O error on device sr0, logical block 0
[ 1741.606448] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1741.606453] sr 1:0:0:0: [sr0]  
[ 1741.606458] sr 1:0:0:0: [sr0]  
[ 1741.606464] sr 1:0:0:0: [sr0]  
[ 1741.606470] sr 1:0:0:0: [sr0] CDB: 
[ 1741.606481] end_request: I/O error, dev sr0, sector 0
[ 1741.606487] Buffer I/O error on device sr0, logical block 0

Kindly help me out here friends. Thank you so much in advance.

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