Partition Offset Information
Alignment Checker for Disk Drives with Large Physical Sectors and 512 Byte Emulation
Partition Offset Information is a simple, single file Windows utility you can run to read and display the starting LBA for every partition. This tool detects disk drives that report themselves as large sector drives, typically 4KiB sectors, and analyzes the starting sector of a partition to see if the logical file system clusters are aligned to the disk drive or not.
Download the Partition Offset Information utility.
Further information on the subject can be found in this .PDF document.