Same here. The system disk (should be sda) is connected to the motherboard IDE 
port.
A secondary disk (should be sdb) is connected to a SATA controler on a PCI 
card. I need to pass kernel options to libata, because the 80c cable is not 
recognised, and the SATA controler is a VIA VT6421, to which I want to pass 
options as well.
However, when the disks are not in the order I expect them to be, the wrong 
options are passed to the wrong ata channel, causing kernel panic or no boot 
waiting for root partition to come up in the worse case.

Similarly, when doing a clean install from the CD, the boot loader was
installed on /dev/sda, which happens to be the SATA drive, whereas the
system boots on the IDE drive (cause grub error 15 from a previous Linux
installation). I had to disconnect the sata drive to resolve the
ambiguity during install.

Mathieu

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10.04RC system boot random assignment of sda, sdb
https://bugs.launchpad.net/bugs/569645
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