Product: All VTrak M-500i/300i/200i
Firmware/Bios Version: Most
Solution: From 0-2 TB the sector size is 512k. From 2-4 TB the sector size is 1028k. Then from 4 + it changes the sector size to 2048k thats why the information is displayed in as unallocated. Following this parameters when expanding should make expanding the array work.