Quick steps:
If you got this error:
Persistent boot order cannot be changed during POST
Make sure that the server was powered off first!
First, look at the partition table:
~ $ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 999.7 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +999.3 GB disk1 Logical Volume on disk0s2 03C9C615-4A75-4F55-BFE2-3D1EFAD7519E Unlocked Encrypted /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *7.8 GB disk2 1: EFI EFI 209.7 MB disk2s1 2: Microsoft Basic Data NCS1002 7.6 GB disk2s2 |
In my case, the USB drive is /dev/disk2.
I want to reformat the device to an MBR-formatted FAT32 partition. To do that, run this command:
sudo diskutil eraseDisk FAT32 {NAME} MBRFormat /dev/disk2 |
where NAME is the name you want to give to the disk.
For example:
~ $ sudo diskutil eraseDisk FAT32 NCS1002 MBRFormat /dev/disk2 Password: Started erase on disk2 Unmounting disk Creating the partition map Waiting for the disks to reappear Formatting disk2s1 as MS-DOS (FAT32) with name NCS1002 512 bytes per physical sector /dev/rdisk2s1: 15210832 sectors in 1901354 FAT32 clusters (4096 bytes/cluster) bps=512 spc=8 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=2 drv=0x80 bsec=15240574 bspf=14855 rdcl=2 infs=1 bkbs=6 Mounting disk Finished erase on disk2 |
Verify the partition table again:
~ $ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 999.7 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +999.3 GB disk1 Logical Volume on disk0s2 03C9C615-4A75-4F55-BFE2-3D1EFAD7519E Unlocked Encrypted /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *7.8 GB disk2 1: DOS_FAT_32 NCS1002 7.8 GB disk2s1 |
I had this problem when I upgraded from Yosemite to El Capitan, the built-in FaceTime HD camera did not activate in the FaceTime and other applications.
To fix this issue, run the following:
sudo killall AppleCameraAssistant AND/OR sudo killall VDCAssistant |
If your camera is still not detected, you might need to restart the system.
That’s it!
I’m using the plugable USB to RS-232 DB9 Serial Adapter here: http://plugable.com/drivers/prolific
Download the Mac OS driver and install it. You will have to restart system when the installation is completed.
Once your system is rebooted, plug in the adapter to your Mac and the RJ-45 connector to the console port of the Cisco router or switch.
Run following command and make sure that the adapter shows up, e.g:
$ ls -ltr /dev/*usb* crw-rw-rw- 1 root wheel 18, 2 Mar 19 22:28 /dev/tty.usbserial crw-rw-rw- 1 root wheel 18, 3 Mar 19 22:28 /dev/cu.usbserial |
Run following command to start a console session:
$ screen /dev/tty.usbserial 9600 |
To disconnect the session, enter Ctrl+A followed by Ctrl+\.
I want to clone the disk of my MacBook Pro in case the original disk fail, I can replace it with the one I cloned and have the system up and running again quickly.
Here are the steps:
That’s it!
