#3 Can't see additional unallocated space after conversion

[Anonymous]

Hello, i have one server with 2.5tb data disk. Because of MBR limitation (2TB) i have converted partition style from MBR to GPT with gptgen without problems and, that solved my problem. But after few months we have decided to add aditional disk to existing partition (rebuild raid5 with new additional disk). But after rebuild new space is not appearing and windows can't see it. I have tested same scenario on virtual test mashine and looks, that there is some problems with GUID partition table after conversion from MBR to GPT. Is it possible somehow solve this problem without data lose? Thank you