1,将一个块设备格式化为fat32的工具有
mkfs.fat32(linux自带该工具)
newfs_msdos(android平台上可以使用该工具)
newfs_msdos -F 32 /dev/block/ram0 -s 8192 -O android -L zhiliao（-F 32的含义是将其格式化为fat32格式，/dev/block/ram0是要被格式化的设备，-s 8192是设备的大小，8192表示的是8192个sector，每个sector大小为512Byte，-O android的含义是fatimg oem的名字，-L zhiliao的含义是盘符在PC端显示的名称）
2，newfs_msdos详细解释
|
option |
description |
|
-N |
Don‘t create a file system: just print out parameters |
|
-B boot |
Get bootstrap from file. |
|
-F FAT-type |
FAT type (one of 12, 16, or 32). |
|
-I volid |
Volume ID. |
|
-L label |
Volume label (up to 11 characters). |
|
-O OEM |
OEM string (up to 8 characters). The default is "BSD 4.4". |
|
-S sector-size |
Number of bytes per sector. |
|
-a FAT-size |
Number of sectors per FAT. |
|
-b block-size |
File system block size (bytes per cluster). |
|
-c cluster-size |
Sectors per cluster. |
|
-e dirents |
Number of root directory entries (FAT12 and FAT16 only). |
|
-f format |
Specify a standard (floppy disk) format |
|
option |
description |
|
-h heads |
Number of drive heads. |
|
-i info |
Location of the file system info sector (FAT32 only). |
|
-k backup |
Location of the backup boot sector (FAT32 only). |
|
-m media |
Media descriptor (acceptable range 0xf0 to 0xff). |
|
-n FATs |
Number of FATs. Acceptable values are 1 to 16 inclusive |
|
-o hidden |
Number of hidden sectors. |
|
-r reserved |
Number of reserved sectors. |
|
-s total |
File system size. |
|
-u track-size |
Number of sectors per track.
|
原文：http://www.cnblogs.com/zhiliao112/p/4067871.html