Today I opened my MacBook Pro and then I noticed that I was not able to enter into external drive which was having all my working files. It is having a little lock on top of it and when I went to find Info then it informs me that each account have "Custom" permissions to acquire to drive, and won't permit me to change those permissions as of to obtain Info dialog window. After that I restarted my system to check if that would assist me but I was only able to see the Apple symbol at startup with a spinning wheel under it. I tried this many times but all the times it comes up with the same result. Please help me.