Salut à toutes et à tous,

Je suis actuellement sur Linux Mint 13 en KDE sur ordinateur portable.

Je viens de téléchager et graver plusieurs disques ISO, celles qui sont dans cette liste.

Aucun problème pour télécharger et graver le DVD ISO, sauf pour Dragora 2.2 X86 64 (celui : dragora-2.2-x86_64.iso 21-Apr-2012 14:31 646M ).

J'utilise K3B pour graver.

J'ai le message suivant d'erreur. Comment l'interpréter ?

Code:
Devices
-----------------------
PIONEER DVD-RW DVRTD11RS 1.01 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System
-----------------------
K3b Version: 2.0.2
KDE Version: 4.8.3 (4.8.3)
QT Version:  4.8.1
Kernel:      3.2.0-23-generic

Used versions
-----------------------
cdrecord: 1.1.11

cdrecord
-----------------------
/usr/bin/wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.11
SCSI buffer size: 64512
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
TOC Type: 1 = CD-ROM
Driveropts: 'burnfree'
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   : 
Vendor_info    : 'PIONEER '
Identification : 'DVD-RW DVRTD11RS'
Revision       : '1.01'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x0011 (DVD-R sequential recording)
Profile: 0x0016 (DVD-R/DL layer jump recording) 
Profile: 0x0015 (DVD-R/DL sequential recording) 
Profile: 0x002B (DVD+R/DL) 
Profile: 0x001B (DVD+R) 
Profile: 0x001A (DVD+RW) 
Profile: 0x0014 (DVD-RW sequential recording) 
Profile: 0x0013 (DVD-RW restricted overwrite) 
Profile: 0x0012 (DVD-RAM) 
Profile: 0x0011 (DVD-R sequential recording) (current)
Profile: 0x0010 (DVD-ROM) 
Profile: 0x000A (CD-RW) 
Profile: 0x0009 (CD-R) 
Profile: 0x0008 (CD-ROM) 
Profile: 0x0002 (Removable disk) 
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags   : SWABAUDIO BURNFREE 
Supported modes: PACKET SAO
Drive buf size : 686080 = 670 KB
FIFO size      : 12582912 = 12288 KB
Speed set to 11080 KB/s
Track 01: data   646 MB        
Total size:      742 MB (73:31.86) = 330890 sectors
Lout start:      742 MB (73:33/65) = 330890 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 2298496 Blocks current: 2298496 Blocks remaining: 1967606
Starting to write CD/DVD at speed   8.0 in real SAO mode for single session.
Last chance to quit, starting real write in    2 seconds.
   1 seconds.
   0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Sending CUE sheet...
Starting new track at sector: 0
Track 01:    0 of  646 MB written.
Errno: 5 (Input/output error), write_g1 scsi sendcmd: no error
CDB:  2A 00 00 00 00 5D 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 71 00 03 00 00 00 00 0A 00 00 00 00 72 01 00 00
Sense Key: 0x3 Medium Error, deferred error, Segment 0
Sense Code: 0x72 Qual 0x01 (session fixation error writing lead-in) Fru 0x0
Sense flags: Blk 0 (not valid) 
cmd finished after 0.008s timeout 200s
/usr/bin/wodim: A write error occured.
/usr/bin/wodim: Please properly read the error message above.
write track data: error after 190464 bytes
Writing  time:  257.139s
Average write speed   2.1x.
Fixating...
Fixating time:    0.003s
/usr/bin/wodim: fifo had 194 puts and 4 gets.
/usr/bin/wodim: fifo was 0 times empty and 1 times full, min fill was 98%.

cdrecord command:
-----------------------
/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=8 -sao driveropts=burnfree -data -tsize=330890s -
Merci d'avance pour vos réponses.

Questions subsidiaires :

1. Quand on a gravé une image ISO d'une distribution Linux sur un DVD, peut-on regraver par dessus ?
2. Qu'est-ce qu'un fichier .sig ?
3. Qu'est-ce qu'un fichier .shalsum ?