Creazione partizione su unità USB

Apple declina di partizionare molte più unità su 10.11 di quanto non fosse in passato. Hai provato il comando "cancella" per soffiare via tutto?

Se non va bene, puoi provare la riga di comando:

diskutil splitpartition

L'aiuto è un po 'ottuso, ma se hai postato il layout che volevi, forse qualcuno potrebbe ottenere il comando per OS X.

Split a pre-existing partition into multiple partitions. All data on the split partition will be lost. The first disk parameter is the one to split; the remaining parameters are as in the diskutil partitionDisk command. Ownership of the affected disk is required.

Valid sizes are floating-point numbers with a suffix of B(ytes), S(512-byte- blocks), K(ilobytes), M(egabytes), G(igabytes), T(erabytes), P(etabytes), or (%)percentage of the total size of the whole disk.

Ecco un sacco di output da un comando per creare tre partizioni su un disco da 64 GB:

$ diskutil splitpartition disk2s2 "MS-DOS FAT12" BOOT_ARMHF 1.0M ExFAT Linux 1.9G "Journaled HFS+" OSX 2G
Started partitioning on disk2s2 Untitled
Splitting
Unmounting disk
Waiting for the disks to reappear
Formatting disk2s2 as MS-DOS (FAT12) with name BOOT_ARMHF
512 bytes per physical sector
/dev/rdisk2s2: 1907 sectors in 1907 FAT12 clusters (512 bytes/cluster)
bps=512 spc=1 res=1 nft=2 rde=512 sec=1952 mid=0xf8 spf=6 spt=32 hds=16 hid=409640 drv=0x80
Mounting disk
Formatting disk2s3 as ExFAT with name Linux
Volume name      : Linux
Partition offset : 411648 sectors (210763776 bytes)
Volume size      : 3708928 sectors (1898971136 bytes)
Bytes per sector : 512
Bytes per cluster: 131072
FAT offset       : 16384 sectors (8388608 bytes)
# FAT sectors    : 16384
Number of FATs   : 1
Cluster offset   : 32768 sectors (16777216 bytes)
# Clusters       : 14360
Volume Serial #  : 56c61e6c
Bitmap start     : 2
Bitmap file size : 1795
Upcase start     : 3
Upcase file size : 5836
Root start       : 4
Mounting disk
Formatting disk2s4 as Mac OS Extended (Journaled) with name OSX
Initialized /dev/rdisk2s4 as a 57 GB case-insensitive HFS Plus volume with a 8192k journal
Mounting disk
Finished partitioning on disk2s2 Untitled
/dev/disk2 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *63.9 GB    disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:       Microsoft Basic Data BOOT_ARMHF              999.4 KB   disk2s2
   3:       Microsoft Basic Data Linux                   1.9 GB     disk2s3
   4:                  Apple_HFS OSX                     61.6 GB    disk2s4

Come richiesto da @bmike, l'ho spostato su una risposta separata (lontano dalla domanda originale). Si prega di fare riferimento alla sua risposta come raccomandata: questa è più di "ulteriori dettagli".

Ecco il comando specifico del risultato

$diskutil splitPartition /Volumes/ubuntu_1404/ 1 exFAT  ubuntu 30G
Started partitioning on disk3s1 ubuntu_1404
Splitting
Unmounting disk
Waiting for the disks to reappear
Formatting disk3s1 as ExFAT with name ubuntu
Volume name      : ubuntu
Partition offset : 32 sectors (16384 bytes)
Volume size      : 58593744 sectors (29999996928 bytes)
Bytes per sector : 512
Bytes per cluster: 32768
FAT offset       : 2048 sectors (1048576 bytes)
# FAT sectors    : 8192
Number of FATs   : 1
Cluster offset   : 10240 sectors (5242880 bytes)
# Clusters       : 915367
Volume Serial #  : 56c61d6b
Bitmap start     : 2
Bitmap file size : 114421
Upcase start     : 6
Upcase file size : 5836
Root start       : 7
Mounting disk
Finished partitioning on disk3s1 ubuntu_1404
/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *30.8 GB    disk3
   1:               Windows_NTFS ubuntu                  30.0 GB    disk3s1