Hard Disk not detected

I tried to install Linux Mageia on a partition in my hdd but I may have done something wrong with the partition and now, not only I can't start Mageia but when I start the computer it takes much longer to start and when it starts windows, I can't find the disk with all my files. I tried to check in diskpart but there wasn't nothing, I also tried checking in the BIOS but it didn't detected the disk. Is it a problem of the disk or something else?