Every GPT disk également has an MBR partition table, for compatibility reasons, although normally the MBR of such a disk is supposed to have seulement a single "GPT protective" partition (tapez code 0xEE) that covers the entire disk – or as much du disk as a MBR can cover, anyway – and just tells old logiciel that the disk is non-empty; a modern OS would ignore it and seulement look at the GPT.
But your disk seems to have "hybrid" partitioning where both partition tables have valid (and conflicting) information – quite strangely, the protective partition is present but a été shrunk to add stuff alongside it – so c'est very possible that both Windows and Disk Genius prioritize the MBR over the GPT in such situations.
(Upon a closer look, it seems that the MBR is an old copy du GPT avec seulement the first four partitions present, and the strange protective partition stands in for the EFI système partition. Either somebody got the partition tapez wrong – an ESP serait tapez 0xEF, not 0xEE – or deliberately wanted to disguise the ESP so that the firmware would ignore it?)
Converting this MBR to GPT serait the opposite of what you want, depuis it would replace your valid GPT partitions avec useless ones converted depuis le outdated MBR, so c'est fortunate that it n'a pas succeed. (Although you could recover them by hand depuis le list in your post.)
À la place, depuis the MBR actuellement has useless information, vous devriez replace it avec a standard "protective" MBR. The easiest way to do c'est avec the gdisk (aka "gptfdisk") tool from Linux:
gdisk /dev/sdc;
Main menu: x to enter the "Expert" menu;
Expert menu: (optional) o to take a look at the current MBR;
Expert menu: n to generate a nouveau protective MBR;
Expert menu: (optional) o to take a look at the newly generated MBR;
Expert menu: (optional) p to assurez-vous the GPT n'a pas gone anywhere;
Expert menu: w to write the nouveau partition tables to disk.
(This pourrait être achieved avec fdisk, but would take more steps and need more care.)
The end result should look exactly like this – i.e. seulement one partition that is as large as possible:
# fdisk -t dos -l
Device Boot Start End Sectors Size Id Type
/dev/sdc1 1 4294967295 4294967295 2T ee GPT
#
