Mac 下格式化U盘

diskutil list 查看U盘盘符：

 lapommedeMacBook-Pro:~ lapomme$ diskutil list
 /dev/disk0 (internal, physical):
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    :      GUID_partition_scheme                        *251.0 GB   disk0
    :                        EFI EFI                     209.7 MB   disk0s1
    :          Apple_CoreStorage Macintosh HD            250.1 GB   disk0s2
    :                 Apple_Boot Recovery HD             650.0 MB   disk0s3
 /dev/disk1 (internal, virtual):
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    :                  Apple_HFS Macintosh HD           +249.8 GB   disk1
                                  Logical Volume on disk0s2
                                  E2BD4617-5A22-46A9-A6F4-D54E3EE92BBC
                                  Unencrypted
 /dev/disk2 (external, physical):
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    :                            CAM                    *62.0 GB    disk2

diskutil eraseVolume 格式化U盘卷

 lapommedeMacBook-Pro:~ lapomme$ sudo diskutil eraseVolume FAT32 UDISKNAME /dev/disk2
 Started erase on disk2 CAM
 Unmounting disk
 Erasing
  bytes per physical sector
 /dev/rdisk2:  sectors in  FAT32 clusters ( bytes/cluster)
 bps= spc= res= nft= mid=0xf0 spt= hds= hid= drv=0x00 bsec= bspf= rdcl= infs= bkbs=
 Mounting disk
 Finished erase on disk2 UDISKNAME

diskutil eraseDisk 格式化U盘

 lapommedeMacBook-Pro:~ lapomme$  sudo diskutil eraseDisk FAT32 NAME MBRFormat /dev/disk2
 Started erase on disk2
 Unmounting disk
 Creating the partition map
 Waiting for the disks to reappear
 Formatting disk2s1 as MS-DOS (FAT32) with name NAME
  bytes per physical sector
 /dev/rdisk2s1:  sectors in  FAT32 clusters ( bytes/cluster)
 bps= spc= res= nft= mid=0xf8 spt= hds= hid= drv=0x80 bsec= bspf= rdcl= infs= bkbs=
 Mounting disk
 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