kd7ota wrote:
They may not be manufacted still, but the old disks in new packages should work just fine. 
Actually, AFAIK, the case looks like this: big companies (like Basf, Verbatim, 3M) take orders for obsolete disks (like 5,25" or 8") and if a number of orders is big enough - they simply push the plug in and short-term production begins :-).
