Hard disk failure?

["Jim MacBaine" <jmacbaine@gmail.com>]

Hello,

one of my hard drives seems to be dying.  To me as a layman this looks
as if the disk should be returned to the shop where I bought it.  Is
this right?

ata1: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x40 { UncorrectableError }
ata1: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x40 { UncorrectableError }
ata1: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x40 { UncorrectableError }
ata1: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x40 { UncorrectableError }
ata1: translated ATA stat/err 0x51/40 to SCSI SK/ASC/ASCQ 0x3/11/04
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x40 { UncorrectableError }
sd 0:0:0:0: SCSI error: return code = 0x8000002
sda: Current: sense key=0x3
    ASC=0x11 ASCQ=0x4
end_request: I/O error, dev sda, sector 145661514

It is a Seagate Barracuda 7200.8 SATA  drive with 200 GB capacity and
a member of a raid5 md device.

Shouldn't the md driver kick mark this drive as faulty and kick it out
of the array? After I noticed the error in the syslog, I had to mark
it faulty manually with mdadm.

Regards,
Jim