I’m currently running High Sierra on a laptop (SSD). I need to install
the full Sierra OS (not just the installer) on a USB drive so I can boot
into Sierra and access my iTunes movies. From what I can tell so far
it’s not possible to run the older Sierra installer on the USB stick
when the laptop is using a newer OS (High Sierra).
Does this mean I have to wipe my laptop and install Sierra (downgrade)
just so I can run the Sierra installer on the USB drive? After which I
will need reinstall High Sierra from a bootable backup?
I’ve also read about creating a partition on the laptop and installing a
different OS that way but that doesn’t seem to work either when
installing an older OS. What is the path of least resistance when
installing an old OS?
Do you know how your SSD is formatted? I don’t remember which version of macOS supported AFPS, but if your SSD is formatted that way, it’s pretty easy to create another volume and boot from that.
Still, it’s also not hard to add/create a partition with Disk Utility on the current boot disk if you have enough free space, even if it’s HFS+. The trick, as you say, is to be able to install the older macOS. There must be articles out there about how to do it.
Maybe this one, which lists several methods.
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The install application can’t be run on the later system but you should be
able to boot it. What you can do is make two HFS partitions on the USB
stick, with that you can create install media on one partition and boot it,
then install to the second partition.
Unless the laptop originally shipped with High Sierra, in which case it
will be locked to that or later.
There’s information about it here:
And of course any of the steps in this have the potential to lose data, so
be sure to read carefully and double check you always have the correct
things selected.
Simon
On Fri, Dec 13, 2019 at 5:33 PM Todd via offtopic <
email@hidden> wrote:
I’m currently running High Sierra on a laptop (SSD). I need to install
the full Sierra OS (not just the installer) on a USB drive so I can boot
into Sierra and access my iTunes movies. From what I can tell so far
it’s not possible to run the older Sierra installer on the USB stick
when the laptop is using a newer OS (High Sierra).
Does this mean I have to wipe my laptop and install Sierra (downgrade)
just so I can run the Sierra installer on the USB drive? After which I
will need reinstall High Sierra from a bootable backup?
I’ve also read about creating a partition on the laptop and installing a
different OS that way but that doesn’t seem to work either when
installing an older OS. What is the path of least resistance when
installing an old OS?