"The maximum default cluster size under Windows XP is 4 kilobytes (KB) because 
NTFS file compression is not possible on drives with a larger allocation size.  
The Format utility never uses clusters that are larger than 4 KB unless you 
specifically override that default either by using the /A: option for 
command-line formatting or by specifying a larger cluster size in the Format 
dialog box in Disk Management. "
  -- http://support.microsoft.com/kb/314878

That also has the following table:

  Drive size            
   (logical volume)      FAT type   Sectors     Cluster size
   -----------------------------------------------------------------------
       15 MB or less     12-bit       8           4 KB
       16 MB - 127 MB    16-bit       4           2 KB
      128 MB - 255 MB    16-bit       8           4 KB
      256 MB - 511 MB    16-bit      16           8 KB
      512 MB - 1,023 MB  16-bit      32          16 KB
    1,024 MB - 2,048 MB  16-bit      64          32 KB
    2,048 MB - 4,096 MB  16-bit     128          64 KB
   *4,096 MB - 8,192 MB  16-bit     256         128 KB Windows NT 4.0 only
   *8,192 MB - 16384 MB  16-bit     512         256 KB Windows NT 4.0 only 


Also see:

"As versions of Windows NT earlier than 3.51 do not support NTFS file 
compression, the default cluster sizes will go above 4k."
  -- http://support.microsoft.com/kb/140365


So it seems that FAT itself goes up to 256KB sector sizes -- but that usually 
Windows prefers you to stay at 4KB or below.

vol_id should still probably support the larger sector sizes, especially
if disk makers are formatting with them against Microsoft's
recommendation.

-- 
vol_id: does not recognise FAT* partitions with sector size 8192
https://bugs.launchpad.net/bugs/147807
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