My 4 day old MacBook Pro is giving me problems and just started today. First off my FreeAgent GoFlex external hard drive switched to read only yesterday, now today it won't even mount. Then about 10 minutes ago I can't drag or drop anything into my Macintosh HD icon on my desktop. it says that it can't be modified. The only way I can is to enter my password every time. When I click on get info, under sharing and permission, It says i can read only. What has happened and how can I fix it?