Formatting an external hard-drive for Mac & PC

ana28

macrumors newbie
Original poster
Apr 16, 2016
1
0
Hi All,

I have having problems in regards the process of formatting my external hard-drive. I am trying to partition my hard-drive so it can be read on both Mac and PC. However, the partition option remains greyed out for my hard drive and when I place the cursor over the greyed out partition option, it states that "Disks with Masterboot record partition maps cannot be partitioned.

What are my options to resolve this issue?

Thanks
Liyana
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
30,432
10,233
California
Just jump over to the erase tab in Disk Utility and you should be able to format it how you want from there.
 
Last edited:

rigormortis

macrumors 68000
Jun 11, 2009
1,813
229
If you want read and write on an external hard disk on both the windows and Mac platforms, the best solution is to use EXFAT.

If you want to do a time machine backup or you want to be able to do a Windows backup to it, then I don't think EXFAT will work
 

jsavvy

macrumors regular
Aug 19, 2011
126
100
EXFAT is probably best, but rigormortis is correct, you can't use it for a time machine destination. Also, don't forget to unmount your drive before partitioning it.
 
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