U盘做ubuntu安装盘之后，识别不到的解决方法

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安装UBUNTU官方说明用U盘做了引导盘之后，发现U盘在其他系统中识别不到了，有的识别出来只有2MB，所以决定在ubuntu下格式化一次。
sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x821a821a

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *          63    65818302    32909120    c W95 FAT32 (LBA)
/dev/sda2        65818366   271418174   102799904+   f W95 Ext'd (LBA)
/dev/sda3       271419392   273418239      999424   82 Linux swap / Solaris
/dev/sda4       273418240   625141759   175861760   83 Linux
/dev/sda5        65818368   271418174   102799903+   7 HPFS/NTFS/exFAT

Disk /dev/sdc: 2105 MB, 2105277440 bytes
65 heads, 62 sectors/track, 1020 cylinders, total 4111870 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id System

从上述信息可以看到/dev/sdc
sudo mkfs.vfat /dev/sdc -I
不加-I参数发现只识别到700多M，ubuntu用U盘做引导盘估计是把U盘分了两个区。-I参数可以重写分区，终于找回来我的2GB U盘了。