最近在测试DD-WRT的USB功能，需要一个ext4格式的U盘，下面就来用Debian来格式化U盘。

系统环境

Debian 7.8 Wheezy 64-bit，Vmware Workstation 10，16GB exFAT文件格式U盘一个

格式化U盘

首先在虚拟机上将U盘连接到虚拟机，这时会弹出窗口提示U盘的文件系统问题，忽略并关闭窗口。

打开Terminal窗口，输入命令查找U盘的路径

# fdisk -l

fdisk命令会输出所有disk

Disk /dev/sda: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 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: 0x0006dbe7 Device Boot Start End Blocks Id System /dev/sda1 * 2048 40136703 20067328 83 Linux /dev/sda2 40138750 41940991 901121 5 Extended /dev/sda5 40138752 41940991 901120 82 Linux swap / Solaris Disk /dev/sdb: 16.0 GB, 16008609792 bytes 255 heads, 63 sectors/track, 1946 cylinders, total 31266816 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 /dev/sdb1 32 31266815 15633392 7 HPFS/NTFS/exFAT