I got my friend's iBook 500 in target disk mode connected to mine. Her HD has been experiencing problems (can't boot past grey apple logo) and needs to be zeroed out. No noises, no obvious hardware failures with the HD, except it won't finish rebuilding in DiskWarrior. Here's what I see in Disk Utility:

The Macintosh HD is greyed out. Does that mean that erasing won't work, that the HD is dead, what?
Here's more info about the drive:

When I try to erase, the progress bar stays like that and the HD doesn't spin or make any attempt to move. fsck -y or Diskwarrior didn't help at all. Time for a new HD?
I hate taking iBooks apart...
