ata command timeout

[auxsvr]

Hello,

I have been running 2.6.18 for two months and the last couple of days these 
error messages have appeared in my logs 
(sata_promise kernel module, sda:SATA sdb:PATA disks):

                                               ata1: command timeout
Feb 17 22:23:14 linux kernel: ata1: no sense translation for status: 0x40
Feb 17 22:23:14 linux kernel: ata1: translated ATA stat/err 0x40/00 to SCSI 
SK/ASC/ASCQ 0xb/00/00
Feb 17 22:23:14 linux kernel: ata1: status=0x40 { DriveReady }
Feb 17 22:23:14 linux kernel: sd 0:0:0:0: SCSI error: return code = 0x08000002
Feb 17 22:23:14 linux kernel: sda: Current: sense key: Aborted Command
Feb 17 22:23:14 linux kernel:     Additional sense: No additional sense 
information
Feb 17 22:23:14 linux kernel: end_request: I/O error, dev sda, sector 
145179585
Feb 17 22:23:14 linux kernel: Buffer I/O error on device sda2, logical block 
2787300
Feb 17 22:23:14 linux kernel: lost page write due to I/O error on sda2

and 

                                               ata1: command timeout
Feb 19 20:39:31 linux kernel: ata1: no sense translation for status: 0x40
Feb 19 20:39:31 linux kernel: ata1: translated ATA stat/err 0x40/00 to SCSI 
SK/ASC/ASCQ 0xb/00/00
Feb 19 20:39:31 linux kernel: ata1: status=0x40 { DriveReady }
Feb 19 20:39:31 linux kernel: sd 0:0:0:0: SCSI error: return code = 0x08000002
Feb 19 20:39:31 linux kernel: sda: Current: sense key: Aborted Command
Feb 19 20:39:31 linux kernel:     Additional sense: No additional sense 
information
Feb 19 20:39:31 linux kernel: end_request: I/O error, dev sda, sector 89553479

without any other ill-effects that I know of(I did smart tests on the drive; 
all passed successfully).
I have read that hddtemp may be the cause of this (I am running version 0.3) 
so is there any reason
to worry and prepare for a HDD replacement?

Kind regards.
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