Thank you for your feedback everybody

I have changed the config and retried - It again failed...  [Crying or Very 
sad]  [Crying or Very sad] 

However seemed to go a bit further - it failed at a slightly different point 
(this time I believe it changed the tape)

Here is the error:-

----------------------------
btape: btape.c:2736 End of tape 814:0. Volume Bytes=812,948,032,512. Write rate 
= 54.28 MB/s
31-Aug 16:51 btape JobId 0: End of medium on Volume "TestVolume1" 
Bytes=812,948,032,512 Blocks=12,601,501 at 31-Aug-2011 16:51.
31-Aug 16:51 btape JobId 0: 3307 Issuing autochanger "unload slot 1, drive 0" 
command.
31-Aug 16:52 btape JobId 0: 3301 Issuing autochanger "loaded? drive 0" command.
31-Aug 16:52 btape JobId 0: 3302 Autochanger "loaded? drive 0", result: nothing 
loaded.
31-Aug 16:52 btape JobId 0: 3304 Issuing autochanger "load slot 2, drive 0" 
command.

31-Aug 16:53 btape JobId 0: 3305 Autochanger "load slot 2, drive 0", status is 
OK.
Wrote Volume label for volume "TestVolume2".
31-Aug 16:53 btape JobId 0: Wrote label to prelabeled Volume "TestVolume2" on 
device "LTO-4" (/dev/nst0)
31-Aug 16:53 btape JobId 0: New volume "TestVolume2" mounted on device "LTO-4" 
(/dev/nst0) at 31-Aug-2011 16:53.
btape: btape.c:2311 Wrote 1000 blocks on second tape. Done.
Done writing 0 records ...
Wrote End of Session label.
btape: btape.c:2380 Wrote state file last_block_num1=15500 last_block_num2=1001
btape: btape.c:2398 

16:53:45 Done filling tapes at 0:1003. Now beginning re-read of first tape ...
btape: btape.c:2476 Enter do_unfill
31-Aug 16:53 btape JobId 0: 3307 Issuing autochanger "unload slot 2, drive 0" 
command.
31-Aug 16:54 btape JobId 0: 3304 Issuing autochanger "load slot 1, drive 0" 
command.
31-Aug 16:55 btape JobId 0: 3305 Autochanger "load slot 1, drive 0", status is 
OK.
31-Aug 16:55 btape JobId 0: Ready to read from volume "TestVolume1" on device 
"LTO-4" (/dev/nst0).
Rewinding.
Reading the first 10000 records from 0:0.
10000 records read now at 1:5084
Reposition from 1:5084 to 813:15500

^[[15~Reading block 15500.
Error reading block: ERR=block.c:1025 Read zero bytes at 813:0 on device 
"LTO-4" (/dev/nst0).

btape: btape.c:2403 do_unfill failed.
----------------------------


This is my config now:-

--------------------------------------------------
Autochanger {
  Name = "Autochanger"
  Device = LTO-4
  Changer Device = /dev/sg1
  Changer Command = "/usr/libexec/bacula/mtx-changer %c %o %S %a %d"
}

Device {
Name = LTO-4
Drive Index = 0
Media Type = LTO-4
Archive Device = /dev/nst0
AutomaticMount = yes;               # when device opened, read it
AlwaysOpen = yes;
AutoChanger = yes
Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
}
--------------------------------------------------

Any help would we really welcomed

Regards

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