I'm running Windows 7 RTM, computer just crashed an hour ago and have noticed that I've lost write access to my D drive formatted in exFat, what gives??
Seems like the entire partition has been reset with a readonly flag.
Seen a couple of solutions on the net.
Try running a new command window in elevated mode, change to drive and run "chkdsk /f".
Or try using diskpart > select disk xx > select vol xx > att vol clear readonly
The diskpart didn't work for me, but chkdsk worked!! Sigh... haven't had to do chkdsk since windows98.