W10 Pro 64 bit, Toshiba Satellite C55 B5100 UEFI/GPT 500GB SATA HD See image of partitions: https://s21.postimg.org/lt3yl0zfr/Partitions.jpg The D partition (50GB) has W8.1 which is what the laptop came with originally. The added C partition has an up-to-date W10. I don't really know what the purpose is of first three partitions, the sixth (819 MB) and the last, RECOVERY. I now have no need for W8.1 so I am thinking about deleting that partition. I have the MiniTool Partition Wizard Pro program with which I could do that. I'm confused by the proper method to do so without causing HD corruption. 1. Delete D. 2. Move C to where D was, keeping C the same size as it is. 3. What about (NTFS) 819 MB (Used: partition, does that need to be move along with C or deleted? 4. Leave RECOVERY alone? I'm guessing that it is related to the original W8.1 OS and is not needed but would removing it cause problems? Suggestions/Advice please.