Can't partition (option greyed out) External HDD on Mac OS X El Capitan

Thanks a million Alberto.U are the man!!😉

You rock, Alberto! This was a huge help, thank you!

Thank you, this worked for me. 🙂

dude this erased my hard drive instead of partitioning it.

As a matter of fact partitioning a disk means destroy its content.

Also the command is quite clear

diskutil erasedisk hfs+ External GPT /dev/disk2

The label Partition in Disk Utility is misleading. The more appropriate word should be Resize.

Many thanks; I have done a feedback submission.

Good stuff ,problem solved ,thanks

From looking over than command it looks like this will "erase disk." Is that correct? I'm looking to keep all of the data without having to format the disk.

Sadly this wont work on my new 4TB WD drive

I tried the work around using terminal as well.diskutil erasedisk hfs+ External GPT /dev/disk2

Still nothing works?

Barry

This thread is marked as solved. Please start your own explaining exactly what your problem is.

OK Ihad to reformat back to OS journaled to solve this then it allowed the partitioning.

It will not allow it to partitioned in EXFAT

Barry

Thank you! at first try using the command you provided I got an error so I was afraid it wasnt gonna work, but luckily when I tried again a few minutes later it did work!

I'm sorry to bother you with this silly simple question but where is the option with the model number? I'm having a tough time locating it. Thanks in advance!