The files at a SSD are major fragmented. Yes, this is good. Ignore this.
I thought it would have been kind of defragmenting.
I don't understand this.
Whatever OS can access the "fragmented" table and thus execute TRIM on that.
No OS can "fragment" the SSD internally.
Only the SSD firmware can access the blocks inside the SSD.
This is SSD firmware internally too. No OS is involved.
It's OS independed. Yes, GC is active.
Still, if 7 doesn't see the XP partition will it be able to do the GC?
TRIM is real time issue, if the OS supports TRIM: Windows 7
The interesting thing is that what the Magician Software seems to do is an on demand TRIM, if that is so, then TRIM is not a real time thing at all, and the data to be trimmed must be hold somewhere (SSD?) meanwhile, in that case my theory would apply.
In addition you may TRIM on demand using the Magician Software: Windows XP and Windows 7
Real world advice:
ignore TRIM theory. You may measure a difference, won't recognice one in real world.
Use the SSD and be happy.