primary slave HDD hangs

[Sergey Matveychuk]

Hello!

I had have a Maxtor 6Y120L0 HDD (120Gb, 2Mb cache) as primary master.
Now I bought Maxtor 6Y160P0 (160Gb, 8Mb cache) and installed it as
slave.
4.8-RELEASE hangs on booting with diagnostic:
ad1: READ command timeout tag=0 serv=0 - resetting
ata0: resetting device

On both -CURRENT and WindowsXP system  is all right. HDD looks working.

Can I do something with it?
I'm ready to disable second disk on 4.8 but I'v got no idea how to do it
without kernel hacking.

Any comments?
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Sem.