mac diskutil command

info

native apple command line utility
1. manipulating disks, partitions and raid set
2. include magnetic hard disks, cds/dvds and flash drives
3. most options except list require root access
the default apple partitioning scheme uses the last physical partition on a disk for storing data

demo

from commandlinemac
1. info on all available disks and their partitions
```
 $ diskutil list
```
2. more detailed info on a particular disk or partitions
```
 $ diskutil info disk-or-partition
```
3. check fs structure of a partition
```
 $ diskutil verifyVolume partition
```
4. if errors are found fix them with
```
 $ diskutil repairVolume partition
```
5. finding out about raid sets
```
 $ diskutil listRAID
```

from langui using dd in os x

find out device labels

 $ $ diskutil list
 /dev/disk0
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    0:      GUID_partition_scheme                        *251.0 GB   disk0
    1:                        EFI EFI                     209.7 MB   disk0s1
    2:          Apple_CoreStorage                         250.1 GB   disk0s2
    3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
 /dev/disk1
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    0:                  Apple_HFS ssd                    *249.8 GB   disk1
                                  Logical Volume on disk0s2
                                  8AE3A13B-FBF6-4000-84F9-A2586C9B65BA
                                  Unencrypted
 /dev/disk2
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    0:     FDisk_partition_scheme                        *16.0 GB    disk2
    1:             Windows_FAT_32 GREE2                   16.0 GB    disk2s1

to write to a mounted usb flash drive

 # we need to unmount it
 # but ejecting it in the normal mac way won't work here
 $ diskutil unmountDisk /dev/disk2

write image file
```
 $ dd if=inputfile.img of/dev/disk2
```

from theinstructional part 1

erasing disks

 $ diskutil eraseDisk JHFS+ GREE2 /dev/disk2

filesystem

 # JHFS+ mac os extended(Journaled)
 $ diskutil listFilesystems
 Formattable file systems

 These file system personalities can be used for erasing and partitioning.
 When specifying a personality as a parameter to a verb, case is not considered.
 Certain common aliases (also case-insensitive) are listed below as well.

 -------------------------------------------------------------------------------
 PERSONALITY                     USER VISIBLE NAME                               
 -------------------------------------------------------------------------------
 ExFAT                           ExFAT                                           
 Free Space                      Free Space                                      
   (or) free
 MS-DOS                          MS-DOS (FAT)                                    
 MS-DOS FAT12                    MS-DOS (FAT12)                                  
 MS-DOS FAT16                    MS-DOS (FAT16)                                  
 MS-DOS FAT32                    MS-DOS (FAT32)                                  
   (or) fat32
 HFS+                            Mac OS Extended                                 
 Case-sensitive HFS+             Mac OS Extended (Case-sensitive)                
   (or) hfsx
 Case-sensitive Journaled HFS+   Mac OS Extended (Case-sensitive, Journaled)     
   (or) jhfsx
 Journaled HFS+                  Mac OS Extended (Journaled)                     
   (or) jhfs+

erasing volumes

 # erasing volumes doesn't erase
 # or affect the entire disk
 # only the volume you specify

 # external drive
 # partitioned with two volumes
 # FirstVolume and SecondVolume
 # to erase SecondVolume
 $ diskutil eraseVolume JHFS+ New /Volumes/SecondVolume

reformatting volumes

 $ diskutil reformat /Volumes/SecondVolume

renaming volumes

 $ diskutil rename "{current name of volume}" "{new name}"

verifying and repairing

 # verifying and repairing volumes
 $ diskutil verifyVolume /Volumes/SecondVolume \
 diskutil repairVolume /Volumes/SecondVolume

 # verifying disk permissions
 $ diskutil verifyPermissions /Volumes/SecondVolume \
 diskutil repair Permissions /Volumes/SecondVolume

from theinstructional part 2

partition a disk

 $ diskutil partitionDisk /dev/disk2 GPT JHFS+ New 0b
 # GPT guid partition table
 # APM Apple partition map
 # MBR Master boot records

 # powerpc-based mac or windows pc boot from GPT
 # intel macs can only boot from guid partitions

 # `0b` represents the size of the partition to create
 # b bytes, m megabytes, g gigabytes
 # `0b` use all available free space

multiple partitioning

 $ diskutil partitionDisk /dev/disk2 GPT JHFS+ First 10g \
 JHFS+ Second 10g \
 JHFS+ Third 10g \
 JHFS+ Fourth 0b

splitting partitions

 $ diskutil splitPartition /dev/disk2s6 JHFS+ Test1 10g JHFS+ Test2 0b

merging partitions

 $ diskutil mergePartitions JHFS+ NewName disk2s4 disk2s6