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I have placed 200GB SanDisk card inside Nifty adapter and put it into SDXC slot in my Mac.

I want to use it as permanent & encrypted storage. Unfortunately encryption requires GUID partition which I tried to create but without any luck. "Partition" option - under "APPLE SD Card Reader Media" in Disk Utility - is greyed out.

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I'm stuck.

P.S. I own Late 2013 Macbook Pro Retina 13" with MacOS Sierra (v10.12.6) installed.

  • It will probably be supplied as MBR, so you need to Erase first. Partition doesn't let you change the underlying format, MBR->GUID – Tetsujin Apr 9 '18 at 12:34
  • @Tetsujin I've already erased that card and changed its format from ExtFAT to MacOS Extended (Journaled). I supplied gif with more information regarding my problem. – Alan Gabriel Bem Apr 9 '18 at 12:40
  • It's still MBR.[partition map Master Boot Record] It needs to be GUID. You can only do that from Erase. – Tetsujin Apr 9 '18 at 12:45
  • Okay, found it :) I can choose partition map when erasing storage. Thank you! – Alan Gabriel Bem Apr 9 '18 at 12:45
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It will probably be supplied as MBR, so you need to Erase first.
Partition doesn't let you change the underlying Partition Map format, MBR->GUID

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