In some cases, the losses were minor. A few games I had played maybe an hour of and nothing more. Others were more extensive. And now a moment of silence for the files lost:
Mario Kart: Double Dash - All Time Trial ghosts. This one is more sentimental than anything. While the rest of the Double Dash records were saved from corruption I lost the Time Trial ghosts all set by my brother. This was one of the few games he would play all the time and he set all the Time Trial records. I lose a piece of him.
Metroid Prime 1 and 2 - 100% completions on Easy and Hard. I can live with losing the Easy saves. It's the Hard completions that are a killer. So, I have to face the Boost Ball guardian again? Great.
Sonic Adventure 2 - All S Ranks and Chao data. This is one of those accomplishments you just have to grind out playing levels over and over again. Some are easy to accomplish than others. The Sonic/Shadow levels I remember being the toughest. But far worse is having to raise a whole new chao from scratch. That was the dullest part of the game as I had to keep going back through levels and getting certain colored crystals to power up my chao in a deficancy. That's a back breaker.
Super Smash Bros. Melee - Everything lost. All trophies, extra stages, extra characters, records, and event data lost. And I had a 100% trophies. Sucks, sucks, sucks, sucks, sucks.
F-Zero GX - Nooooooooo. The crown jewel in my Gamecube accomplishments. Lost. Everything unlocked. All racers, vehicles and parts. All stages and cups unlocked. All characters beating an expert race giving me their little clip video and 100% story mode on expert completed. And at least half of the staff ghosts on Time trials beaten with my winning ghost data lost. You don't know the heartbreak of having to hitting the delete button and realizing the hours sunk in this game are now lost.
These were the games that hurt the most because of the time sunk into them. I lost other things like all my Battalion Wars data but I never got around to finishing with all S-Ranks so I can absorb that loss a bit easier. And other situations like that.