I was browsing in my disk management, in the computer management,

Then i have right click on one of my disk and i see Convert to dynamic Disk !!

What is that .. and what this do ?!

DON'T ... DO ... IT

Dynamic Disk enables a few extra features which let you set up an emulated/software RAID. For example you could 'span' two physical disks so that they appear combined in a single humongous drive letter (this is suicidal because if one disk fails, you can say bye-bye to the data on all of them). You can also do the opposite - set up one drive to mirror another one, allowing you to recover data if one drive goes down, at the expense of losing 1/2 your space.

Unless you have a need to enably dynamic volumes, don't do it. Once you convert, there is no going back short of a format. Oh, and no drive recovery/partitioning tools support dynamic disks.

Hmm didn't think about that. My games drive is dynamic but if I loose stuff on there I aint too fussed. Won't be doing that in future again!

Thx for thoses Info Zone!!!!