It will start selling 64 megabyte (MB) and 32 MB SD Memory Cards on June 30, producing up to 100,000 of each a month, and plans to launch 256 MB cards in the year starting April 2001.SD Memory Cards are postage stamp-sized flash memory cards with built-in copy protection, developed by Matsushita, SanDisk Corp. and Toshiba Corp. 70 to 90 companies including Hewlett Packard, Eastman Kodak, Motorola