Older versions of Windows, such as 2000 and XP 32-bit, use Master Boot Record which does not support volumes larger than 2TB. When the total capacity of the RAID is 2TB or higher, you must format the array using GPT in Windows. GPT format is only supported by Windows XP 64-bit Edition, Windows 2003 Server, Windows Vista, Windows 7, and Mac OS X. GPT format will not work with XP 32-bit or older Windows operating systems. If you want to use Windows 2000 and/or XP 32-bit, you will need to run the ForteRAID in a RAID mode that creates a usable volume that is 2TB or less. The following models are smaller than 2TB and are compatible: 1TB and 2TB (any drive mode); 3TB and 4TB (RAID 1, RAID 3 + hot spare, RAID 5 + hot spare, RAID 10); 6TB and 8TB (RAID 1).