I've never came across with such great vendors lately. It exactly gives idea of true business model. Long story in short, I've managed to recover 200 GB of lost files from external Seagate hard drive that failed abruptly using Stellar Phoenix Software for Windows (Priced at $100 USD).
Product performed well and recovered all of important files in less than 5 hours. That's pretty short for such large capacity drives. I'm really thankful to support team for their gentleness and not getting annoyed with the stupid questions.
Thanks once again!