Hard Disk

Hi all,

I’ve got two physical IDE harddisk hooked up in my PC. But after waking up this morning. I noticed that in ‘My Computer’ there’s one drive missing.

My question would be:

1) What’s wrong with the harddisk?
2) Is there any implications from this as I’ve just changed the motherboard of my PC.
3) Is there any way to recover the data on the harddisk?

Thank you in advance.