what is the manufacturing processes of an external hard drive?
You design a nice box, put a USB-interface in it, stick a harddisk in it. Then flog it.
There are no external hard drives per se. There are external enclosures for normal hard drives.
You're missing the best bit RBS - You flog it for twice the price!
Would it be possible to turn an internal harddrive into an external one then...without buying to much hardware?
Yes, you can buy an external hard drive enclosure.. They do sell them without drives inside too.
Sorry Tedster. Flog is english slang for sell. I have no idea why I used it though. I don't usually!
See Tedster you learn more than you bargained for. In this neck of the woods its a proper verb.