Quote:
hda:diskerror:read_intr

It means you either have hard disk trouble, or, if you're 100 percent certain you aren't having hardware disk or cable trouble, then it might mean you need to do a full erase of the dynamic data partition.

I had exactly that problem, where it was refusing to read the playlist from the scratch partition. After making certain that there was no hardware trouble with the disk, I did the full erase of the dynamic data partition and the problem went away and everything worked again.
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Tony Fabris