I've repurposed a 32 GB M.2 SATA SSD as a bootable "USB stick" and I'm putting useful tools on it. So far I've got memtest, seatools, gparted live, system rescue, clonezilla, and a live install iso of the distro installed on my PC. What other great bootable tools am I sleeping on?
Testdisk is great. I recently cleaned a drive with diskpart and after the initial 100bpm "oh shit, wrong drive" moment, I fixed the partition structure with testdisk. Took a while, but pretty simple and easy to use.