3 TiB can only be handled successfully when partitioned with GPT. XP doesn't know GPT. HDM 12 Server does not provide GPT for XP as well. As far as your screenshots are readable for very young people with a very strong magnifier it seems that all disks are in MBR partitioning scheme. The area beyond 2.2 TiB will not be available this way. I'd suggest: Use a 21st century OS, try to copy as much possible data in Windows explorer to other places, kill the partitions on your 3 TiB drive, convert it to GPT and create new partitions. If your OS is 32 bit create only partitions < 2.2 TiB.