This is the most common error on Hyper-V with DSM 7.

🚀 Would you like a specific guide on how to for a high-disk-count build?

Use StarWind V2V Converter to transform the .img into a "VHDX local file."

Deploying DSM 7.x on Hyper-V using the Tinycore Redpill loader is a complex but rewarding process for virtualization enthusiasts. The procedure requires careful attention to storage controllers (IDE vs. SCSI) and driver injection.