Disk recovery - DD10 does not see the drive

Hello All,

I'm having a problem with hdd (750Gb drive was used a storage media with a single partition, now I see logical drive with 128GB+570Gb unallocated space in Disk Management). I've read some advices to use DD to recover the disk, hence I installed the trial version. Unfortunately, DD does not see this drive at all (even though BIOS see it ok as well as disk management). Is it a sort of restriction of a trial version?

Thanks