volume size error using sdvdbackup

[Jean-Christophe Michel <jc.michel@symetrie.com>]

Hi,

I'm still trying to get sdvdbackup work to produce os x readable disks 
of a netatalk linux server volume shared to a mac os x LAN.
I came to this script:

======
#!/bin/sh
#
# (c) 2006 jcm Symétrie
# sauvegarde de répertoire netatalk pour relecture sur os x

export SDVDBACKUP_MKISOFS="mkisofs -dDRN -allow-leading-dots -hfs 
--netatalk --double -mac-name -part --osx-double -graft-points"
sdvdbackup /var/sharedvol
======

I get this:
=====
...
 99.39% done, estimate finish Tue Dec 26 19:50:19 2006
 99.59% done, estimate finish Tue Dec 26 19:50:19 2006
Total extents actually written (inc HFS) = 2530242
(Size of ISO volume = 2523846, HFS extra = 6396)
Total translation table size: 0
Total rockridge attributes bytes: 2003530
Total directory bytes: 5445632
Path table size(bytes): 26980
Max brk space used 12df000
2530392 extents written (4942 MB)

Note: cd_backup_planer added 138 bytes of checksum padding

/usr/local/save/scdbackup-0.8.6/scripts/growisofs_wrapper

1+0 enregistrements lus.
1+0 enregistrements écrits.
307200 bytes transferred in 0,004881 seconds (62938593 bytes/sec)
Executing 'builtin_dd 
if=/usr/local/save/scdbackup-0.8.6/tmp/-afio_compression of=/dev/hdc 
obs=32k seek=0'
:-( /dev/hdc: 2297888 blocks are free, 2530542 to be written!
+++ failed to write backup volume
aborted
=====


So it seems it thinks to use afio compression ?
I tried to play with various values in sdvdbackup_media_cap_value
but it didn't change the amount it intended to write in the first disk.

Where is my error ?

--
Jean-Christophe Michel