The old small IDE disk is probably not worth the effort of re-installing Ubuntu and then openSUSE again.
While the disk still works under Windows 7, I’ll buy a new SATA disk to replace the IDE disk.
Carlos and Henk, You helped me figuring out what the problem is.
Again thank you, dank u wel, ¡muchasgracias!
Henk, I’ve re-installed Ubuntu 11.10, and after updating the system and re-booting, my external IDE USB Windows-NTFS disk was automatically recognized, and I’m using it right now.
Copying data works fine between the external disk and the Ubuntu PC.
Re-installing openSUSE became necessary anyway because yesterday BTRFS on the system disk got corrupted (however, the second internal BTRFS disk still works fine under Ubuntu).
So I thought re-installing Ubuntu and testing the NTFS disk was only an incremental additional effort.
Excerpt from error messages on the screen of the corrupted system (I shot a photograph):
btrfs: corrupt leaf, slot offest bad: block=4480483328,root=1,s....
BUG: unable to handle kernel NULL pointer dereference at 000000....
...
could not mount root filesystem -- exiting to /bin/sh
...
sh: no job control in this shell
Wonder why BTRFS on openSUSE’s system disk got corrupted.
Will later re-install openSUSE and see how things work then.
I’ve re-installed openSUSE 12.1, and the external USB NTFS disk automatically showed up in Dolphin.
All directories and files on the disk were accessible.
A nice surprise.
Today I’ve run in YaST an online update of the system successfully (which was not possible over the last few days because the system always complained about a wrong checksum for dolphin-4.7.2-4.4.1.x86_64.rpm).
Now the negative surprise: While the system update worked, the USB disk doesn’t show up anymore.
Very strange.
Will report a bug on bugzilla.