diskutil list 查看U盘盘符：
1 lapommedeMacBook-Pro:~ lapomme$ diskutil list 2 /dev/disk0 (internal, physical): 3 #: TYPE NAME SIZE IDENTIFIER 4 0: GUID_partition_scheme *251.0 GB disk0 5 1: EFI EFI 209.7 MB disk0s1 6 2: Apple_CoreStorage Macintosh HD 250.1 GB disk0s2 7 3: Apple_Boot Recovery HD 650.0 MB disk0s3 8 /dev/disk1 (internal, virtual): 9 #: TYPE NAME SIZE IDENTIFIER 10 0: Apple_HFS Macintosh HD +249.8 GB disk1 11 Logical Volume on disk0s2 12 E2BD4617-5A22-46A9-A6F4-D54E3EE92BBC 13 Unencrypted 14 /dev/disk2 (external, physical): 15 #: TYPE NAME SIZE IDENTIFIER 16 0: CAM *62.0 GB disk2
diskutil eraseVolume 格式化U盘卷
1 lapommedeMacBook-Pro:~ lapomme$ sudo diskutil eraseVolume FAT32 UDISKNAME /dev/disk2 2 Started erase on disk2 CAM 3 Unmounting disk 4 Erasing 5 512 bytes per physical sector 6 /dev/rdisk2: 121080896 sectors in 1891889 FAT32 clusters (32768 bytes/cluster) 7 bps=512 spc=64 res=32 nft=2 mid=0xf0 spt=32 hds=255 hid=0 drv=0x00 bsec=121110528 bspf=14781 rdcl=2 infs=1 bkbs=6 8 Mounting disk 9 Finished erase on disk2 UDISKNAME
diskutil eraseDisk 格式化U盘
1 lapommedeMacBook-Pro:~ lapomme$ sudo diskutil eraseDisk FAT32 NAME MBRFormat /dev/disk2 2 Started erase on disk2 3 Unmounting disk 4 Creating the partition map 5 Waiting for the disks to reappear 6 Formatting disk2s1 as MS-DOS (FAT32) with name NAME 7 512 bytes per physical sector 8 /dev/rdisk2s1: 121080896 sectors in 1891889 FAT32 clusters (32768 bytes/cluster) 9 bps=512 spc=64 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=2 drv=0x80 bsec=121110526 bspf=14781 rdcl=2 infs=1 bkbs=6 10 Mounting disk 11 Finished erase on disk2
UDISKNAME是格式化后的U盘的名称
linux下：
列出磁盘列表：fdisk -l
格式化：
mkfs -t
$ mkfs -t vfat /dev/sdb1
mkfs.vfat 3.0.13 (30 Jun 2012)
格式化为fat32格式
mkfs -V -t
$ mkfs -V -t vfat /dev/sdb1
mkfs (util-linux 2.20.1)
mkfs.vfat /dev/sdb1
mkfs.vfat 3.0.13 (30 Jun 2012)
创建文件系统，并显示信息，此处-V必须放在-t前面