If it's lost data that may be recoverable, I've used Active@ File recovery successfully before

Active@ File Recovery Professional

I've got the professional version, about $45.

The claim is: "Efficient & easy to use recovery tool for deleted or lost files, damaged or re-formatted volumes, even if your PC doesn't boot. Recovery software provides ability to detect and recover files,volumes & disks lost due to deletion, formatting, physical damage, viruses & other..."

This program definitely worked for me. A customer had provided me with a completely failed disk (C: drive) and I managed to recover just about everything.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones