This is the preferred method
wmic partition get BlockSize, StartingOffset, Name, Index

diskpart list partition Output
Repeat:  Use caution when using for alignment info
Offset info is in KB—too imprecise for our purposes
C:\Windows\System32>diskpart
 Microsoft DiskPart version 6.0.6000
  On computer: ASPIRINGGEEK
 DISKPART> list disk
     Disk ###  Status      Size     Free     Dyn  Gpt
   --------  ----------  -------  -------  ---  ---
   Disk 0    Online        93 GB  1024 KB
  DISKPART> select disk 0
 Disk 0 is now the selected disk.
  DISKPART> list partition
   Partition ###  Type              Size     Offset
   -------------  ----------------  -------  -------
   Partition 1    OEM                 47 MB    32 KB
   Partition 2    Primary             10 GB    48 MB
   Partition 3    Primary             81 GB    10 GB
   Partition 0    Extended          2048 MB    91 GB

Getting the file allocation unit size
fsutil fsinfo ntfsinfo c:
Output for default NTFS format

C:\>fsutil fsinfo ntfsinfo c:
NTFS Volume Serial Number :       0x3a16ff9d16ff5879
Version :                         3.1
Number Sectors :                  0x000000000a2397ff
Total Clusters :                  0x00000000014472ff
Free Clusters  :                  0x000000000025b76a
Total Reserved :                  0x00000000000051f0
Bytes Per Sector  :               512
Bytes Per Cluster :               4096
Bytes Per FileRecord Segment    : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length :           0x0000000007c90000

IMPORTANT:  Correlation of Partition Offset & Stripe Unit Size
The following formula must result in an integer value:
Partition_Offset ÷ Stripe_Unit_Size
Note:  Ask your SAN Man (or Woman) for Stripe Unit Size
Example A
Partition Offset = 32,768 bytes (exactly 32KB)
Stripe Unit Size = 65,536 bytes (exactly 64KB)
32,768 / 65,536 = 0.5 
Even though the offset was changed from the default 31.5KB, the partition is still misaligned!
Example B
Partition Offset = 65,536 bytes (exactly 64KB)
Stripe Unit Size = 65,536 bytes (exactly 64KB)
65,536 / 65,536 = 1.0
Good!
Source:  Robert Smith

The stripe unit size must correlate with the file allocation unit size
Here, too, an integer value is required
Example A
Stripe Unit Size = 65,536 bytes (exactly 64KB)
File Allocation Unit Size = 65,536 bytes (exactly 64KB)
65,536 / 65,536 = 1.0 
Good!
Example B
Stripe Unit Size = 262,144 bytes (exactly 256KB)
File Allocation Unit Size = 65,536 bytes (exactly 64KB)
262,144 / 65,536 = 4.0
Good!