Hard drive reformatting question. Quick reply please!

[luckydog]

I want to reformat my hard drive, but it says it needs to be dismounted and asks me if I want to force a dismount. What does this mean?

I'm am running a slave right now, should I unplug it and try again?

A quick reply would be great, thanks for the help guys, you've helped me out alot in the short time I've been here. Thanks

 

[lhuser]

deleting the partition table to rewrite it maybe?

 

[luckydog]

What does that mean? I tried unplugging the slave and it didn't do anything.