YaST2 and Packages on HD

Having some spare disc space (and time), I copied my 3 7.3 Personal CD's to HD at /data1/SuSE/cd1, cd2, cd3. Now, when I try to point YaST2 to these - specifically /data1/SuSE/cd1 - it says "No installation data found on medium" and clicking More details gives "Could not mount the source medium". Of course, I thought, because it's already mounted. So, I unmounted it. But it makes no difference. I can't find anything on the support database. Any suggestions. (BTW, I tried YaST(1). It appears to work OK.) -- Vic