> What is Memtest86 3.2 ? AFAIK, it's a tool for memory testing, as indicated by its name:) > What do we mean by 'write back current data' ? where does the External > Cache write it back ? How does writing back help ? IMHO, before you disable the cache, you should first write back data stored in it, other wise we will have data lost.CMIIW. regards, Yang -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/