Hi again,
I postponed the BIOS backup and update,
but came forward a giant leap.

Originally Posted by
ratzi
It wouldn't probably make sense to explicity create a GPT partition table
using the parted command mklabel gpt.
Or would it ??
I know now, that yes, it would.
But that would only be the 1st step of the solution, because there are more things to do.
In order to avoid introducing errors, I went another way:
I deleted all partitions again.
Then I first installed oS 12.1 64 bit instead of Windows7.
Et voila:
Booting from the oS 12.1 64 bit installer DVD before all else I read
ELILO boot ... 
Fine.
During the installation I then get
Code:
Suggested Partitioning
* Set disk label of /dev/sda to GPT
* Create boot volume /dev/sda1 (156.88 MB) with vfat
* Create swap volume /dev/sda2 (2.01 GB)
* Create root volume /dev/sda3 (20.00 GB) with ext4
* Create volume /dev/sda4 (1.80 TB) for /home with ext4
Aha, set disk label of /dev/sda to GPT ... 
Given 8 GB of RAM I usually would choose a different swap size,
but for convenience I left all these settings as they were, at least for now.
I proceed with the installation and finally oS 12.1 64 bit boots from HD without problems.
parted und fdisk now give:
Code:
iHost:~ #
iHost:~ # parted
GNU Parted 2.4
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: ATA Hitachi HDS72302 (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 1049kB 165MB 164MB fat16 primary boot
2 165MB 2319MB 2155MB linux-swap(v1) primary
3 2319MB 23.8GB 21.5GB ext4 primary
4 23.8GB 2000GB 1977GB ext4 primary
(parted) quit
iHost:~ #
iHost:~ # fdisk -l
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 3907029167 1953514583+ ee GPT
iHost:~ #
iHost:~ #
Very nice ! 
Seems that it can work, if the programmers of an OS just want to,
which in the case of Windows 7 doesn't seem to be so. 
OK, now I'll temporarily delete the oS 12.1 partitions again,
while leaving disk label/partition table as GPT,
and leaving the fat16 UEFI boot partition as is.
Then I'll try to install Windows 7 and see what that does.
Reason: experience usually was that installing Windows first leads to less problems for a multiboot.
I'll come back then.
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