Manuel Bouyer wrote:
> On Fri, Aug 31, 2007 at 08:09:41AM -0700, Brian Buhrow wrote:
>   
>> 	Hello.  We're running these exact same drives, modulo a revision
>> number, on our backup server, and have been for over a year without
>> incident.  We're using them in conjunction with Promise SATA controllers
>> driven by the pdcsata(4) driver.
>>     
>
> What is your disklabel on these drives ?
> There seems to be an alignement condition for this problem to show up.
>
>   
Sorry, been away for the weekend. The disklabel on the drive is as follows:

disklabel: Invalid signature in mbr record 0
# /dev/rwd1d:
type: ESDI
disk: Autowd0
label: 20070728
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 969020
total sectors: 976772160
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # microseconds
track-to-track seek: 0  # microseconds
drivedata: 0

7 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
 a:   3072000        63     4.2BSD   1024  8192 46552  # (Cyl.      0*-   3047*)
 b:   1228800   3072063       swap                     # (Cyl.   3047*-   4266*)
 c: 976773105        63     unused      0     0        # (Cyl.      0*- 969020+)
 e:  10240000   4300863     4.2BSD   1024  8192 46552  # (Cyl.   4266*-  14425*)
 f:  37525504  14540863     4.2BSD   1024  8192 55192  # (Cyl.  14425*-  51653*)
 g: 922779648  52066367     4.2BSD   1024  8192 55200  # (Cyl.  51653*- 967109*)
disklabel: partition c: partition extends past end of unit

It only seems to exhibit on this particular model. The WD5000AAJS, the WD5000AAKS doesn't seem to have the same problem. Also tried with a 500GB Seagate just to make sure.