guru-666:
Pictures will give you an idea. Search Ebay for "compact flash ide" and you will find hundreds of them, ranging from $2 and up.
I used one of these in my A4000 earlier, but due to a defective Compact Flash card I converted to a quiet 2.5" disk instead.
They behave just like an ordinary disk. My A4000 booted in zero point zip seconds. The only noise heard came from the PSU fan.
Highly recommended if you want an ultra quiet 600 or 1200.