What are the sector sizes on Mac OS X? I read on the HFS Plus Wikipedia page that the default sector size on a Mac is 512 b. However, I also read that Macs support 4kb sectors. How can I determine which I have, 512 b or 4 kb sectors? I think 512 is the right answer, but I would like to be sure.
In terminal, you can use diskutil to get information about the drive, including the device block size:

$ diskutil info / | grep "Block Size"
  Device Block Size:        512 Bytes