Yes. You can have multiple partitions and OSes on different parts. My working drive I use for jobs has 13 partitions on it. Installers from 10.5.8 through to 10.12.1, then bootable drives in various flavours. Then a “spare” part for other things. (updates, image files etc). As a note, only some machine will boot certain systems. But those two should be fine.
Kind regards Daniel Sent from my iPhone 7 --- Daniel Kerr MacWizardry Phone: 0414 795 960 Email: <daniel AT macwizardry.com.au> Web: <http://www.macwizardry.com.au> **For everything Apple** NOTE: Any information provided in this email may be my personal opinion and as such should be taken accordingly, and may not be the views of MacWizardry. Any information provided does not offer or warrant any form of warranty or accept liability. It would be appreciated that if any information in this email is to be disseminated, distributed or copied, that permission by the author be requested. > On 25 Nov 2016, at 1:15 pm, Matt Falvey <[email protected]> wrote: > > Hi I am looking to partition a portable external hard drive. > > I am wondering if it is possible to put two different OS on the partition? > (OS X 10.9.5 on one half and OS X 10.10.5 on the other.) > > Thanks > > Matt. > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>

