Because exchange 2003 will read/write in 4k chunks have a default offset of 63 sectors will cause the occational read from the uneven partition size to result in 2 IOPS. This over time will create a measurable, and in large enviroments, unwanted read performance.
Dispar.exe has been integrated into Diskpart.exe (Sever 2003 sp1+?)
diskpart.exe
diskpart> select disk 1 (1 or other disk # obtained from diskmgmt.msc)
diskpart> create partition primary align = 32
There is a good technet blog on this issue: http://blogs.technet.com/b/exchange/archive/2005/08/10/408950.aspx
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