fc13 crash journal commit error

[Randolph Jones]

I bought an M4A785-M ASUS board, wd 1g sata drive, installed fc13.
        seems to run ok; but when I leave it unattended for a while i
return to
        find hard crash; no video-kbd; 
        reboot required, where I find lots of orphaned inodes
        using it just now when got syslogd msg
        journal commit error; system failure as above
        fsck seems to repair it
        smartctl says disk is ok
        had this problem with new 500m wd disk; exchanged it for 1g disk
        same problem
        dmesg has following
        failed command: READ FPDMA QUEUED
        ata1.00: cmd 60/08:18:38:3a:04/00:00:0a:00:00/40 tag 3 ncq 4096
in
                 res 40/00:04:98:bd:13/00:00:12:00:00/40 Emask 0x50 (ATA
bus
        error)
        ata1.00: status: { DRDY }
        ata1.00: failed command: READ FPDMA QUEUED
        ata1.00: cmd 60/08:20:d8:09:ab/00:00:31:00:00/40 tag 4 ncq 4096
in
                 res 40/00:04:98:bd:13/00:00:12:00:00/40 Emask 0x50 (ATA
bus
        error)
        ata1.00: status: { DRDY }
        ata1: hard resetting link
        
        any ideas would be greatly appreciated
        TIA
        rfjones