In my case it seems to be just my new Hitachi 80Gb HD. It boots when it likes with the ACA. I've never had this problem with Cf HD's.
If it were a Cf I would throw it to the bin, but I like to have so much room for the first time.
Edit: And 1time I don't want a firmware to slow down the card, as I think that's what it has to make... And I get 10,02 Mips with this Hd on my ACA1231/42