I was trying to burn an iso image to cd using cdrecord. It was not working.
What is my mistake?

cdrecord -scanbus
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
scsidev: 'ATA'
devname: 'ATA'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.83-RH '@(#)scsi-linux-sg.c 1.83 04/05/20 Copyright 1997 J. Schilling').
scsibus0:
0,0,0 0) 'HL-DT-ST' 'RW/DVD GCC-4240N' 'E112' Removable CD-ROM
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *


cdrecord -v -eject dev=0,0,0 FC-i386-disc1.iso
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent default s.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
cdrecord: No such file or directory. Cannot open '/dev/pg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

That iso name may need to be checked, seems like it should be something like FC4.....
The dev line uses ATA on newer Linux systems.
For example:

cdrecord -v -eject dev=ATA:0,0,0 FC4-i386-disc1.iso
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
scsidev: 'ATA:0,0,0'
devname: 'ATA'
scsibus: 0 target: 0 lun: 0
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.8 3-RH '@(#)scsi-linux-sg.c 1.83 04/05/20 Copyright 1997 J. Schilling').
SCSI buffer size: 64512
atapi: -1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'HL-DT-ST'
Identifikation : 'RW/DVD GCC-4240N'
Revision : 'E112'
Device seems to be: Generic mmc2 DVD-ROM.
Current: 0x0009
Profile: 0x0010
Profile: 0x0008
Profile: 0x0009 (current)
Profile: 0x000A
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-2 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1705200 = 1665 KB
FIFO size : 4194304 = 4096 KB
Track 01: data 634 MB
Total size: 728 MB (72:12.28) = 324921 sectors
Lout start: 729 MB (72:14/21) = 324921 sectors
Current Secsize: 2048
ATIP info from disk:
Indicated writing power: 4
Is not unrestricted
Is not erasable
Disk sub type: Medium Type A, low Beta category (A-) (2)
ATIP start of lead in: -12508 (97:15/17)
ATIP start of lead out: 359845 (79:59/70)
Disk type: Short strategy type (Phthalocyanine or similar)
Manuf. index: 22
Manufacturer: Ritek Co.
Blocks total: 359845 Blocks current: 359845 Blocks remaining: 34924
Speed set to 4234 KB/s
Starting to write CD/DVD at speed 24.0 in real TAO mode for single session.
Last chance to quit, starting real write 0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
trackno=0
BURN-Free is OFF.
Performing OPC...
Starting new track at sector: 0
Track 01: 8 of 634 MB written (fifo 100%) [buf 99%] 10.2x.cdrecord: Success. write_g1: scsi sendc md: no error
CDB: 2A 00 00 00 11 8F 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 00 00 00 0A 00 00 00 00 0C 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x0C Qual 0x00 (write error) Fru 0x0
Sense flags: Blk 0 (not valid)
resid: 63488
cmd finished after 0.026s timeout 40s

write track data: error after 9205760 bytes
cdrecord: A write error occured.
cdrecord: Please properly read the error message above.
Writing time: 16.023s
Average write speed 351.3x.
Min drive buffer fill was 99%
Fixating...
Fixating time: 0.003s
cdrecord: fifo had 209 puts and 146 gets.
cdrecord: fifo was 0 times empty and 131 times full, min fill was 92%.

Sorry, I completely forgot -data

cdrecord -v -eject dev=ATA:0,0,0 -data FC4-i386-disc1.iso
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
scsidev: 'ATA:0,0,0'
devname: 'ATA'
scsibus: 0 target: 0 lun: 0
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.83-RH '@(#)scsi-linux-sg.c 1.83 04/05/20 Copyright 1997 J. Schilling').
SCSI buffer size: 64512
atapi: -1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'HL-DT-ST'
Identifikation : 'RW/DVD GCC-4240N'
Revision : 'E112'
Device seems to be: Generic mmc2 DVD-ROM.
Current: 0x0009
Profile: 0x0010
Profile: 0x0008
Profile: 0x0009 (current)
Profile: 0x000A
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-2 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1705200 = 1665 KB
FIFO size : 4194304 = 4096 KB
Track 01: data 634 MB
Total size: 728 MB (72:12.28) = 324921 sectors
Lout start: 729 MB (72:14/21) = 324921 sectors
Current Secsize: 2048
ATIP info from disk:
Indicated writing power: 4
Is not unrestricted
Is not erasable
Disk sub type: Medium Type A, low Beta category (A-) (2)
ATIP start of lead in: -12508 (97:15/17)
ATIP start of lead out: 359845 (79:59/70)
Disk type: Short strategy type (Phthalocyanine or similar)
Manuf. index: 22
Manufacturer: Ritek Co.
Blocks total: 359845 Blocks current: 359845 Blocks remaining: 34924
Speed set to 4234 KB/s
Starting to write CD/DVD at speed 24.0 in real TAO mode for single session.
Last chance to quit, starting real write 0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
trackno=0
BURN-Free is OFF.
Performing OPC...
Starting new track at sector: 0
Track 01: 128 of 634 MB written (fifo 100%) [buf 99%] 10.3x.cdrecord: Success. write_g1: scsi sendcmd: no error
CDB: 2A 00 00 01 00 99 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 00 00 00 0A 00 00 00 00 0C 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x0C Qual 0x00 (write error) Fru 0x0
Sense flags: Blk 0 (not valid)
resid: 63488
cmd finished after 7.297s timeout 40s

write track data: error after 134531072 bytes
cdrecord: A write error occured.
cdrecord: Please properly read the error message above.
Writing time: 104.734s
Average write speed 42.9x.
Min drive buffer fill was 99%
Fixating...
Fixating time: 0.003s
cdrecord: fifo had 2183 puts and 2120 gets.
cdrecord: fifo was 0 times empty and 2106 times full, min fill was 92%.

Did you try that last one with a new cd?

with a new cd again:

cdrecord -v -eject dev=ATA:0,0,0 -data FC4-i386-disc1.iso
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
scsidev: 'ATA:0,0,0'
devname: 'ATA'
scsibus: 0 target: 0 lun: 0
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.83-RH '@(#)scsi-linux-sg.c 1.83 04/05/20 Copyright 1997 J. Schilling').
SCSI buffer size: 64512
atapi: -1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'HL-DT-ST'
Identifikation : 'RW/DVD GCC-4240N'
Revision : 'E112'
Device seems to be: Generic mmc2 DVD-ROM.
Current: 0x0009
Profile: 0x0010
Profile: 0x0008
Profile: 0x0009 (current)
Profile: 0x000A
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-2 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1705200 = 1665 KB
FIFO size : 4194304 = 4096 KB
Track 01: data 634 MB
Total size: 728 MB (72:12.28) = 324921 sectors
Lout start: 729 MB (72:14/21) = 324921 sectors
Current Secsize: 2048
ATIP info from disk:
Indicated writing power: 4
Is not unrestricted
Is not erasable
Disk sub type: Medium Type A, low Beta category (A-) (2)
ATIP start of lead in: -12508 (97:15/17)
ATIP start of lead out: 359845 (79:59/70)
Disk type: Short strategy type (Phthalocyanine or similar)
Manuf. index: 22
Manufacturer: Ritek Co.
Blocks total: 359845 Blocks current: 359845 Blocks remaining: 34924
Speed set to 4234 KB/s
Starting to write CD/DVD at speed 24.0 in real TAO mode for single session.
Last chance to quit, starting real write 0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
trackno=0
BURN-Free is OFF.
Performing OPC...
Starting new track at sector: 0
Track 01: 50 of 634 MB written (fifo 100%) [buf 99%] 10.5x.cdrecord: Success. write_g1: scsi sendcmd: no error
CDB: 2A 00 00 00 64 25 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 00 00 00 0A 00 00 00 00 0C 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x0C Qual 0x00 (write error) Fru 0x0
Sense flags: Blk 0 (not valid)
resid: 63488
cmd finished after 0.024s timeout 40s

write track data: error after 52504576 bytes
cdrecord: A write error occured.
cdrecord: Please properly read the error message above.
Writing time: 44.183s
Average write speed 107.1x.
Min drive buffer fill was 99%
Fixating...
Fixating time: 0.003s
cdrecord: fifo had 891 puts and 828 gets.
cdrecord: fifo was 0 times empty and 813 times full, min fill was 92%.

Do you know who wrote this useless programme? I have spent several hours and this lame programme could not burn a single CD!!!

Try this;

First, which device is your burner; cat /etc/fstab
Second, it seems you might be having some buffer/dma problems so try slowing the burn speed down, for example assuming the burner is /dev/hdc;

cdrecord -v speed=8 dev=/dev/hdc -data -eject FC4-i386-disc1.iso