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  • I'm pretty sure it's because the drive is MBR, not GUID. You might have to do it from Terminal - see if apple.stackexchange.com/questions/79480/… makes any sense
    – Tetsujin
    Commented Sep 24, 2015 at 16:24
  • It doesn't like the fact that this is an MBR disk. You could create and exFAT partition on the Windows system that you can use with the Mac or you could backup all the data to a different HDD and then change the drive from MBR to GPT.
    – Techpumpkin_WD
    Commented Sep 25, 2015 at 14:36
  • @Techpumpkin_WD ExFAT could work, but how reliable is it for Time Machine? The idea is I want to use the partition for Time Machine and would like for my backups to NOT get corrupted (considering ExFAT has no journaling I don't know how it could be reliable...).
    – Someguy123
    Commented Sep 25, 2015 at 16:13
  • Time Machine cannot be set up on ExFat, it must be HFS+ [or Xsan]
    – Tetsujin
    Commented Sep 26, 2015 at 13:52
  • As said ExFAT won't work with Time Machine, I guess the only option you have left is too change the HDD to the GPT style.
    – Techpumpkin_WD
    Commented Sep 28, 2015 at 12:17