Hi Richter,
Welcome to Amiga Org. What is the make and model of your 2.5" hard drive? Some 2.5" hard disk drives will not work with the Amiga 1200 or 600. If your Amiga 1200 is in a PC tower case then by all means use a standard 3.5" hard drive. For some reason the Amiga 1200 does not like some of the Seagate or Western Digital hard drives, so I would recommend using a Fujitsu or Quantum drive instead. I come across hard drives all the time that I could sell to you guys cheap. :-D
