Linux下SD卡分区操作说明

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2011-07-21 13:43:54| 分类：嵌入式开发 | 标签：linux sd卡分区 |举报|字号订阅一使用linux下的磁盘管理工具fdisk

sudo fdisk /dev/sdc //fdisk=format disk

使用fdisk打开你的SD卡设备名称,我的sd卡设备名称是sdc

二进入fdisk管理工具

打开后进入如下界面

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u').

Command (m for help): m Command action

a toggle a bootable flag b edit bsd disklabel

c toggle the dos compatibility flag d delete a partition

l list known partition types m print this menu n add a new partition

o create a new empty DOS partition table p print the partition table q quit without saving changes

s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit

x extra functionality (experts only)

Command (m for help):

我们只需要使用到fdisk的的几个主要命令

m：使用帮助

n: 创建一个分区

d: 删除一个分区

p:打印分区信息

t:修改分区ID，通过修改ID我们可以改变分区格式，例如windows的fat32格式id为6和linux下ext3格式id为83

w:保存分区信息并退出

三：创建分区

1,打印显示已有分区

输入p

Command (m for help): p

Disk /dev/sdc: 1967 MB, 1967128576 bytes 57 heads, 56 sectors/track, 1203 cylinders

Units = cylinders of 3192 * 512 = 1634304 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/sdc1 1 23 36680 83 Linux /dev/sdc2 24 34 17556 83 Linux

2，删除已有分区

输入d之后选择分区编号

Command (m for help): d Partition number (1-4): 1

Command (m for help): d Selected partition 2

3，新建分区

3.1建立主分区

输入n

Command (m for help): n Command action

e extended

p primary partition (1-4) p

Partition number (1-4): 1

First cylinder (1-1203, default 1): 1

Last cylinder, +cylinders or +size{K,M,G} (1-1203, default 1203): 23

输入n后选择p建立一个主分区，选择分区编号为1，分区起始柱面位置(first cylinder)选择1，末端位置（last cylinder）选择23

3.2建立扩展分区

Command (m for help): n Command action e extended

p primary partition (1-4) e

Partition number (1-4): 2

First cylinder (24-1203, default 24): Using default value 24

Last cylinder, +cylinders or +size{K,M,G} (24-1203, default 1203): Using default value 1203

输入n后选择e建立一个扩展分区，选择编号2，起始位置和末端选择默认的24~1023

3.3建立逻辑分区

Command (m for help): n Command action

l logical (5 or over)

p primary partition (1-4) l

First cylinder (24-1203, default 24): Using default value 24

Last cylinder, +cylinders or +size{K,M,G} (24-1203, default 1203): 43 输入n后选择l建立一个逻辑分区，选选择起始和末端位置为24～43

建立第二个逻辑分区

Command (m for help): n Command action

l logical (5 or over)

p primary partition (1-4) l

First cylinder (44-1203, default 44): Using default value 44

Last cylinder, +cylinders or +size{K,M,G} (44-1203, default 1203): Using default value 1203

三修改分区ID

输入t

Command (m for help): t Partition number (1-6): 1

Hex code (type L to list codes): 6

Changed system type of partition 1 to 6 (FAT16)

选择编号为1的分区，这里我将id设为6（FAT16格式，ext32格式的id为83）

同理修改其他分区的id

四，保存退出

Command (m for help): p

Disk /dev/sdb: 1967 MB, 1967128576 bytes 57 heads, 56 sectors/track, 1203 cylinders

Units = cylinders of 3192 * 512 = 1634304 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 1 23 36680 6 FAT16 /dev/sdb2 24 1203 1883280 5 Extended /dev/sdb5 24 43 31892 83 Linux /dev/sdb6 44 1203 1851332 83 Linux

这里可以看见我刚刚建立的分区

输入w

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.

The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8)

WARNING: If you have created or modified any DOS 6.x partitions, please see the fdisk manual page for additional information. Syncing disks.

保存退出，之前我以为到这一步就完事来，其实不然还有下面的

四：格式化分区

在第三步之后你会发现你的sd卡丝毫反应，这是因为第三步仅仅是写入分区表信息而没有完成格式化

FAT格式分区格式化命令 mkfs.vfat /dev/sdb1