Recovering lost data from a very old backup (disaster recovery)

Hi all,
I am trying to restore and recover data from an old DAT-72 cassette. All I know is the date when the backup was taken, that is back in November 2006. I do not know the DBID or anything else except for the date.
To recover this, I bought an internal SCSI HP c7438a DAT-72 tape drive on eBay and installed it on a machine running Windows 2003 Server SP2. I made a fresh Oracle 11g Enterprise Edition installation. HP tape drivers have been installed and Windows sees the tape drive without problem. To act as a Media Manager, I have installed Oracle Secure Backup. Oracle Secure Backup sees the HP tape drive without problems as well.
I have to admit my information about Oracle is not very in-depth. I read quite a lot of documents, but the more I read the more confused I become. The closest thing I can find to my situation is the following guide about disaster recovery:
http://download.oracle.com/docs/cd/B10500_01/server.920/a96566/rcmrecov.htm#1007948
I tried the suggestions in this document without success (details below).
My questions are:
1. Is it possible to retrieve data without knowing the DBID?
2. If not, is it possible to figure out the DBID from the tape? I tried to use dd in cygwin, also booted with Knoppix/Debian and Ubuntu CDs to dump the contents of the tape with dd but all of them failed to see the tape device. If there is any way to dump the raw contents of the tape on Windows, I would also welcome input.
3. Is there any way at all to recover this data from the tape given all the unknowns?
Thanks very much in advance,
C:\Program Files>rman target orcl
Recovery Manager: Release 11.2.0.1.0 - Production on Sat Mar 19 15:01:28 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
target database Password:
connected to target database: ORCL (not mounted)
RMAN> SET DBID 676549873;
executing command: SET DBID
RMAN> STARTUP FORCE NOMOUNT; # rman starts instance with dummy parameter file
Oracle instance started
Total System Global Area 778387456 bytes
Fixed Size 1374808 bytes
Variable Size 268436904 bytes
Database Buffers 503316480 bytes
Redo Buffers 5259264 bytes
RMAN> RUN
2> {
3> ALLOCATE CHANNEL t1 DEVICE TYPE sbt;
4> RESTORE SPFILE TO 'C:\SPFILE.TMP' FROM AUTOBACKUP MAXDAYS 7 UNTIL TIME 'SYS
DATE-1575';
5> }
using target database control file instead of recovery catalog
allocated channel: t1
channel t1: SID=63 device type=SBT_TAPE
channel t1: Oracle Secure Backup
Starting restore at 19-MAR-11
channel t1: looking for AUTOBACKUP on day: 20061125
channel t1: looking for AUTOBACKUP on day: 20061124
channel t1: looking for AUTOBACKUP on day: 20061123
channel t1: looking for AUTOBACKUP on day: 20061122
channel t1: looking for AUTOBACKUP on day: 20061121
channel t1: looking for AUTOBACKUP on day: 20061120
channel t1: looking for AUTOBACKUP on day: 20061119
channel t1: no AUTOBACKUP in 7 days found
released channel: t1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 03/19/2011 15:03:26
RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece
RMAN>
RMAN> RUN
2> {
3> ALLOCATE CHANNEL t1 DEVICE TYPE sbt
4> PARMS 'SBT_LIBRARY=C:\WINDOWS\SYSTEM32\ORASBT.DLL';
5> RESTORE SPFILE TO 'C:\SPFILE.TMP' FROM AUTOBACKUP MAXDAYS 7 UNTIL TIME 'SYS
DATE-1575';
6> }
allocated channel: t1
channel t1: SID=63 device type=SBT_TAPE
channel t1: Oracle Secure Backup
Starting restore at 19-MAR-11
channel t1: looking for AUTOBACKUP on day: 20061125
channel t1: looking for AUTOBACKUP on day: 20061124
channel t1: looking for AUTOBACKUP on day: 20061123
channel t1: looking for AUTOBACKUP on day: 20061122
channel t1: looking for AUTOBACKUP on day: 20061121
channel t1: looking for AUTOBACKUP on day: 20061120
channel t1: looking for AUTOBACKUP on day: 20061119
channel t1: no AUTOBACKUP in 7 days found
released channel: t1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 03/19/2011 15:04:56
RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece
RMAN>
-----------------------------------

Hi 845725,
If the backups were created with OSB might be you can query the tape with obtool.
http://www.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14236/obref_oba.htmTo list pieces you could use <lspiece> within obtool.
http://www.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14236/obref_oba.htm#BHBBIFFEIf this works you should be able to identify the controlfile autobackup if it has the standard naming < c-dbid-date-xx > and you than know the DBID or you are able to restore a controlfile from a backup piece in the output list.
Might be you have to install 9i or 10g rdbms software as 11g was released a year later in 2007.
Anyway goodluck.
Regards,
Tycho

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