I have a couple of questions that have been bugging me a while about my setup. I've got a 15" mbp, about 2 years old. Running 10.8.5. 2.4 GHz Cor i7. On my desktop, in the upper right, I've got two hard drive icons. One is titled Macintosh HD. The other is "500 gb Drive alias". They seem to be the same thing when I click on them. can I delete one of these? Also -- I've got a WD external drive connected to my Airport Extreme (the old, flat kind). But after years of working fine, my computer no longer seems to see it. I don't see it on Finder or in Airport Utilities. I assume this means there is something wrong? Also, when I check About Mac, Hardware, SATA/SATAExpress I have this: Volumes: disk0s1: Capacity: 209.7 MB (209,715,200 bytes) BSD Name: disk0s1 Content: EFI Macintosh HD: Capacity: 749.3 GB (749,296,615,424 bytes) Available: 344.37 GB (344,370,847,744 bytes) Writable: Yes File System: Journaled HFS+ BSD Name: disk0s2 Mount Point: / Content: Apple_HFS Volume UUID: 0FD7B608-6522-397D-BF61-C573FAFC6F1A Recovery HD: Capacity: 650 MB (650,002,432 bytes) BSD Name: disk0s3 Content: Apple_Boot Volume UUID: F3E647E5-CDEA-3873-890D-9BA1444A22A1 Are there three drives there? Am I just hopelessly confused? Everything seems to be working fine -- other than that my Time Machine no longer backs up to the WD external drive.