Accessing UFS partitions from a Macbook

Jon Radel jon at
Thu Apr 20 14:39:28 UTC 2017

On 4/20/17 10:09, Ian Smith wrote:

> So I tried logging in as root with su -l but her usual administration
> password wasn't the one, and she knows nothing about a root password.

There is no root password.  As a user with administrative rights (which
would be the sole user on a Mac setup completely the default way) just:

sudo bash

and you'll have a root shell.  (My Mac is not setup the default way, so
I have to su to a privileged account first and then run sudo, but I'm a
touch odd and and a little more paranoid than some Mac users.)

> So two questions from someone with next to no Mac experience:
> Should I expect UFS partitions within a slice to be accessible on Macs?
> If not, might a UFS partition occupying the whole raw slice fare better?

I would very much not expect it to work unless you install a driver for
UFS filesystems on the Mac.  Macs use a different filesystem natively
and, while they support some foreign filesystems, UFS isn't on that
list.  The techniques at

may still work; I certainly haven't tested them.

If doing software development on a Mac isn't your thing and you just
want to solve the file transfer problem, I'd suggest a drive formatted
in that ancient, lowest common denominator, filesystem:  MSDOS/FAT.

--Jon Radel
jon at

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