WD1001FALS sector size


I have two WD1001FALS drives.  I would like to use them in a Windows Home Server (v1) so I have to be concerned about the sector size.  I’ve been searching this evening and I can’t seem to find any documentation that tells me if these drives are advanced format or not.  I can’t find anything on the packaging or the drive itself the would indicate it has 4k sectors.  Not sure if makes any difference, but one has a date of  27SEP2009 and the other is 15FEB2012. Sorry if this is obvious, but I just can’t seem to find it.


WD only uses the Advanced Format in their Caviar Green drives.