Dear sir, I am sorry, I forgot to told you that my machine is MS-Windows 98. I create every disk from DOS-Prompt shell with the command "rawrite2 -f baseXX-10.bin -d a:". Regards, Somchai Limsiroratana lsomchai@e7sun-1.kais.kyoto-u.ac.jp Agric. Process Engineering and Technology Lab. Kyoto University, Kyoto, 606 JAPAN Tel , Fax : 81-75-7536171 Tel(home) : 81-75-7038169 ICQ# 29410074