I'm running the Knoppix 4 live DVD and trying to burn a cd-r with K3B. K3B reports the following when I try to burn - Probably a buffer underrun occurred & Please choose a lower burning speed. I've done that, going from 32x all the way to 2x. The error comes up immediately, before K3B ever touches the cd-r. Here's the debugging output:

Devices
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HL-DT-ST RW/DVD GCC-4320B 1.00 (/dev/hdd, ) at /cdrom1 [CD-R; CD-RW; CD-ROM; DVD-ROM] [DVD-ROM; CD-ROM; CD-R; CD-RW] [SAO; TAO; RAW; SAO/R16; RAW/R96P; RAW/R96R]
TOSHIBA ODD-DVD SD-R5272 1030 (/dev/hdc, ) at /cdrom [CD-R; CD-RW; CD-ROM; DVD-ROM; DVD-R; DVD-RW; DVD+R; DVD+RW] [DVD-ROM; DVD-R Sequential; DVD-RW Restricted Overwrite; DVD-RW Sequential; DVD+RW; DVD+R; CD-ROM; CD-R; CD-RW] [SAO; TAO; RAW; RAW/R96R]

System
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K3b Version: 0.11.20
KDE Version: 3.4.1
QT Version: 3.3.4
Kernel: 2.6.11

cdrecord
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/usr/bin/cdrecord: Warning: Running on Linux-2.6.11
/usr/bin/cdrecord: There are unsettled issues with Linux-2.5 and newer.
/usr/bin/cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Error: Cannot gain SYS_RAWIO capability.Is cdrecord installed SUID root?
: Operation not permitted
/usr/bin/cdrecord: Warning: using inofficial version of libscg (ubuntu-0.8ubuntu1 '@(#)scsitransp.c 1.91 04/06/17 Copyright 1988,1995,2000-2004 J. Schilling').
SCSI buffer size: 64512
/usr/bin/cdrecord: Cannot allocate memory. Cannot get SCSI I/O buffer.
Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Joerg Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
and thus may have bugs that are not present in the original version.
Please send bug reports and support requests to <[email protected]>.
The original author should not be bothered with problems of this version.
TOC Type: 1 = CD-ROM
Using libscg version 'ubuntu-0.8ubuntu1'.
Driveropts: 'burnfree'

cdrecord comand:
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/usr/bin/cdrecord.mmap -v gracetime=2 dev=/dev/hdc speed=32 -tao -dummy driveropts=burnfree -eject -data -tsize=24982s -

mkisofs
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24982
/usr/bin/mkisofs: Connection reset by peer. cannot fwrite 32768*1

mkisofs comand:
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/usr/bin/mkisofs -gui -graft-points -volid K3b data project -volset -appid K3B THE CD KREATOR VERSION 0.11.20 (C) 2003 SEBASTIAN TRUEG AND THE K3B TEAM -publisher -preparer K3b - Version 0.11.20 -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-knoppix/k3bO02OVb.tmp -rational-rock -hide-list /tmp/kde-knoppix/k3bcWz9fa.tmp -full-iso9660-filenames -iso-level 2 -path-list /tmp/kde-knoppix/k3bkX9zQb.tmp /home/knoppix/.kde/share/apps/k3b/temp/dummydir0/

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Any help is appreciated.