2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 7.
2009-10-10 11:25:49 WARNING: GRUB::GrubDev2UnixDev: No partition found for /dev/sda with 4.

Fstab shows 
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part5 swap           swap
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part7 /              ext4
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part6 /home          ext3
/dev/disk/by-id/usb-WDC_WD80_0JB-00FMA0-0:0-part1 /media/sdc1 ext3
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part1 /mnt/sda1      ext3
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part2 /mnt/sda2      ext3
/dev/disk/by-id/ata-ST3500641A_3PM2162S-part3 /mnt/sda3      ext3
/dev/disk/by-id/ata-WDC_WD800JB-00JJC0_WD-WCAM9M709068-part1 /mnt/sdb1 ext3
/dev/disk/by-id/ata-WDC_WD800JB-00JJC0_WD-WCAM9M709068-part2 /mnt/sdb2 ext3
proc      /proc                proc       defaults              0 0
sysfs     /sys                 sysfs      noauto                0 0
debugfs   /sys/kernel/debug    debugfs    noauto                0 0
usbfs     /proc/bus/usb        usbfs      noauto                0 0
devpts    /dev/pts             devpts     mode=0620,gid=5       0 0