Well that isn't correct in many areas:
1. no one is forced to upgrade anything.
2. if their existing hard drive is in good order with plenty of space no problem, no need to upgrade anything.
3. if they buy a new drive after 2011 I doubt that the regular hard disks will have disappeared off the planet. In fact they will probably be cheaper.
4. Microsoft don't mention sector size when talking of a file format, FAT32/NTFS but of a cluster size.
http://support.microsoft.com/kb/140365All file systems used by Windows organize your hard disk based on cluster (or allocation unit) size, which represents the smallest amount of disk space which can be allocated to hold a file.
So that also represents wasted space over and above this sector size mentioned, if the cluster size is 4K then there are 8 of these sectors to the cluster and in theory 7 of them would be wasted if the file is less than 512bytes. Unless these guys are talking about cluster size, which I doubt.
Any half decent partitioning tool can change the cluster size, which I did on my system to better suit the file sizes and to minimize wasted space. XP can theoretically support HDDs up to 256TB with a cluster size of 64KB, none of those around.
That site seems suitably named FUDzilla.