Hi. I've made a lot of research about this problem before I post this. I found a lot of posts having a similar issue, but all the posts didn't have a resolving answer. I'm hoping that this one will. I have a mac pro with 3 SATA drives in it. All drives are the same type, all came originally with the mac. Today, I turned on the computer, and the first thing I got is a message saying "The disk you inserted was not readable by this computer" with three options saying "initialize", "ignore" and "eject." I clicked "initialize" and it opened the Disk Utility for me and I noticed different things: The first thing I noticed is a drive named "Media" on top of the list. It doesn't have any information. Total Capacity is 0. Its Connection ID is Bay 3 (The dead drive apparently). I don't know why it is named Media. It cannot be erased, verified nor repaired. All options are grayed out. The second thing I noticed is that the 3rd drive is missing from the list. It had the name Macintosh HD 3 but now it's not there. I opened the Finder to check things out. Macintosh HD 3 is not there. Even this drive Media is not there also. I rebooted the Mac using the recovery mode. I went to the Disk Utility. Same thing. Media is on top. Disk 3 is missing. What happened before that? Last night. I tried to create an encrypted blank disk image inside Macintosh HD 3 but the process was stopped for some reason. I don't remember what was the message. The image file was there in the drive although the process stopped. I couldn't delete it. I suspect that this could be related to the disk failure somehow, because the drive used to be empty and idle the whole time. Similar Problem: http://forums.macrumors.com/showthread.php?t=1235243 Do you think the drive is dead?