For some time I'm experiencing difficulties with my hardware.
I have a music server running on Ubuntu10.04.
The mainboard is a Gigabyte GA-MA790FXT-UD5P (http://www.gigabyte.com/search/searc...-ma790fxt-ud5p
Approx. four out of five times my dvd-rw is not available to the system.
If I wish to burn a cdrom, the computer has to be restarted three or four times before the dvd-rw is available.
But then it always works without a flaw.
This morning after booting, the system started and displayed a message: "Disk sdf is not ready for mounting, press S to skip or M to fix the problem"
I pressed M and edited /etc/fstab, then continued to start-up.
Then I started Disk Utility. The harddisk sdf is clearly visible: it's a Samsung HD642JJ and according to three different Smart tests the disk is healthy.
But the harddisk is completely absent in the rest of the system. The blkid command does not report sdf, and 'fdisk -l' does not print anything about sdf.
As far as I have been able to test the hardware is healthy. All connections are in good condition, there are no loose connectors.
So after thinking about these problems I have a suspicion towards hald and/or the enumerator.
But I know very little about that technical stuff ...
I have attached the dmesg output.
Any expert's advice is welcome!