Hi mototrucker, i do not have expantion in my A 1200, but have one I hope to put in latter, and my install disk worked fine day before but I just could not configure how to use it after advise from youI tried to format H/D but I did it with format option on W?B 3.1 and was pleased to see that now at least my hard drive was reconised just need now to load W/B3.1 onto H/D, but like I said Install sstarts to load an just continues to cycle, just hope i havn't corrupted it as noticed that writ protect was not sellected on floppy