To assist others who happen on this thread and how to find hard disk sector size on Windows (Taken from this page):
Find sector size using the System Information utility
Open the Windows System Information utility.
In the System Information window, in the left navigation menu, click the + (plus) symbol next to Components.
Click the + symbol next to Storage.
Click the Disks option under Storage.
Find the Bytes/Sector entry on the window's right side. The number next to that entry is the size of each sector on the hard drive.
Find sector size using the fsutil command
Open the Windows command line with admin privileges. (When opening the Windows command line, select the Run as administrator option to get admin privileges in the command line.)
In the command line window, type:
fsutil fsinfo ntfsinfo <driver_letter>
where <driver_letter> is the driver letter of the hard drive you want to view the sector size.
Press Enter to execute the fsutil command.
In the command output, locate the Bytes Per Sector entry, which displays the sector size for that hard drive.