The macos is /dev/sdf, it is not  mounted in Linux, actually it says
that the partition table is unknown. Disk was prepared by the MacOS
installer. blkid returns nothing.

[    3.363646] sd 4:0:0:0: Attached scsi generic sg7 type 0
[    3.363653] sd 4:0:0:0: [sdf] 781420655 512-byte logical blocks: (400 GB/372 
GiB)
[    3.363745] sd 4:0:0:0: [sdf] Write Protect is off
[    3.363746] sd 4:0:0:0: [sdf] Mode Sense: 00 3a 00 00
[    3.363828] sd 4:0:0:0: [sdf] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
[    3.373930]  sdf: unknown partition table
[    3.374062] sd 4:0:0:0: [sdf] Attached SCSI disk


kbryd@quad:~$ sudo parted /dev/sdf
GNU Parted 2.3
Using /dev/sdf
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                                
Backtrace has 8 calls on stack:
  8: /lib/x86_64-linux-gnu/libparted.so.0(ped_assert+0x31) [0x7f21cea62491]
  7: /lib/x86_64-linux-gnu/libparted.so.0(+0x3f8c6) [0x7f21cea928c6]
  6: /lib/x86_64-linux-gnu/libparted.so.0(ped_disk_new+0x49) [0x7f21cea67f49]
  5: parted() [0x406dff]
  4: parted(interactive_mode+0x101) [0x40db71]
  3: parted(main+0x153d) [0x4065bd]
  2: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f21ce23fec5]
  1: parted() [0x406617]

You found a bug in GNU Parted! Here's what you have to do:

Don't panic! The bug has most likely not affected any of your data.
Help us to fix this bug by doing the following:

Check whether the bug has already been fixed by checking
the last version of GNU Parted that you can find at:

        http://ftp.gnu.org/gnu/parted/

Please check this version prior to bug reporting.

If this has not been fixed yet or if you don't know how to check,
please visit the GNU Parted website:

        http://www.gnu.org/software/parted

for further information.

Your report should contain the version of this release (2.3)
along with the error message below, the output of

        parted DEVICE unit co print unit s print

and the following history of commands you entered.
Also include any additional information about your setup you
consider important.

Assertion (last_usable <= disk->dev->length) at
../../../libparted/labels/gpt.c:994 in function _parse_header() failed.

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https://bugs.launchpad.net/bugs/1299740

Title:
  Ubuntu 14.04 Final Beta installer hangs

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