I have never had very good results with DiskSalv, but know some other members here swear by it.
You really should just replace the drive with a 2gb to 20gb drive that you can find pretty easily and very cheap from an old dead laptop. I wouldn't be surprised if you could find one of the less than 10gb laptop drives for free, or almost free from many different sources as they are useless in any of today's modern computers.
Then get AmigaOS3.9 installed on it with BoingBags 1 & 2 and you will be all set to utilize the entire drive and partitions larger than the old 2gb size limit.
Have fun with your A1200HD, probably the most versatile Amiga ever produced with the greatest number of third party add-on hardware products available for it.
