The following reply was made to PR kernel/6531; it has been noted by GNATS.
From: Mark Kettenis <[email protected]> To: [email protected] Cc: [email protected], [email protected] Subject: Re: kernel/6531: wd(4) LBA48 hard disk problem and fix on Apple Macintosh MacBook Pro Date: Tue, 28 Dec 2010 16:29:22 +0100 (CET) Can you try a -current kernel? It has some changes that make pciide(4) do DMA. That makes disk I/O much faster and might actually fix the issue as well.
