Time Capsule is incredibly helpful – it’s saved me from several moderately catastrophic data loses. What is less than terrific, however, is the instructions for connecting an external hard disk drive (HDD) to it. To save myself the hassles of figuring out how to set it up again in the future, and for those who are searching for the solution, I’ve thrown this together.
Many drives are shipped partitioned to FAT. That’s great…for PCs. Heck, my Macbook could read it too, but doing so crashed my Time Capsule. I figured that it was probably FAT, and so just opened up the Disk Utility to erase the drive and partition it to HFS+ (Journal). Then I found out that this element of OS X has been broken for a long, long time.