I have a Seagate Barracuda 1TB drive I installed in my computer quite awhile ago as a secondary drive for file storage. The primary was a 256 GB SSD NVMe drive that came with my dell computer, which has the OS Partition and recovery partition. I wanted to replace that with a larger SSD, so I cloned the drive, removed the old, installed the new and everything was fine, except the OS partition on the new primary drive was still the original size of the partition on the original drive and I wanted to increase it. Bitlocker was enabled on the drive, and I wanted to change to a dynamic disk so I could extend the partition to the unused space on the drive. I run Windows 10 Home and bitlocker is controlled from the BIOS. I disabled bitlocker and when I booted back into Windows I had to enter the bitlocker password to access the primary drive. It booted into Windows and when I went to enter the key for the secondary drive, it failed. I opened Disk Management and found the drive as unallocated and no drive letter was associated. I've tried a number of software recovery tools and so far have struck out in recovering the volume. Any ideas about how to fix this? I'm at a loss.