I am new to Linux and am currently trying to copy / clone a hard drive with an XP OS to another.

The source drive shows up as hda1
The destination drive is an IDE on a USB adapter and shows up as sda. It has some old data on it which I assume will be overwritten.

Both drives are 20.4Gb

I believe I need to use "dd if=/dev/hda of=/dev/sda" to clone the drive.

I have gone to run and typed BASH.
I then typed su
I then typed the command shown above. The hard drive light pulses 1 or 2 times a seconds. After about 12 hours the command had not finished. I cancelled the operation and checked the destination drive in Linux. Nothing had changed on it.

Any ideas as to what I am doing wrong?