用什么命令格式化SD卡？

[VOKU]

[mraandtux]

试试磁盘实用工具。

[速腾1994]

mkfs.ext4 /dev/sdb1，2,，3

[速腾1994]

mkfs.vfat /dev/sdb1,2,3

[速腾1994]

需要安装dosfstools
arch

代码： 全选

yaourt -S dosfstools

ubuntu

代码： 全选

 sudo apt-get install dosfstools

[速腾1994]

首先你要测试你的sdcard的位置

代码： 全选

sudo fdisk -l

确认位置 /dev/sda这个大多是硬盘
/dev/sdb1?
/dev/sdc1?

[VOKU]

试试磁盘实用工具。

[mraandtux]

那就Unmount掉SD卡呗

[VOKU]

z@z:~$ sudo mkfs.vfat /dev/sdc
mkfs.vfat 3.0.3 (18 May 2009)
mkfs.vfat: unable to open /dev/sdc



出错了！

[VOKU]

那就Unmount掉SD卡呗

一，格式化SD卡，为什么要先umount？
二，umount命令，是否相当于菜单"卸载"？
三，umount命令的完整格式？

[速腾1994]

sudo unmount /dev/sdc1

[速腾1994]

sdc1
sdc2
不是sdc

[VOKU]

z@z:~$ sudo umount /dev/sdc1
z@z:~$ sudo mkfs.vfat /dev/sdc1
mkfs.vfat 3.0.3 (18 May 2009)
mkfs.vfat: unable to open /dev/sdc1
z@z:~$


umount了，但是不能格式化啊！

[VOKU]

用“磁盘实用工具”格式化，显示以下错误：
Error erasing: helper exited with exit code 1: In part_del_partition: device_file=/dev/sdc, offset=16384
Entering MS-DOS parser (offset=0, size=16039018496)
MSDOS_MAGIC found
looking at part 0 (offset 16384, size 16039002112, type 0x0c)
new part entry
looking at part 1 (offset 0, size 0, type 0x00)
new part entry
looking at part 2 (offset 0, size 0, type 0x00)
new part entry
looking at part 3 (offset 0, size 0, type 0x00)
new part entry
Exiting MS-DOS parser
MSDOS partition table detected
Warning: Unable to open /dev/sdc read-write (Read-only file system). /dev/sdc has been opened read-only.
got it
Warning: Unable to open /dev/sdc read-write (Read-only file system). /dev/sdc has been opened read-only.
got disk
got partition - part->type=0
Warning: Unable to open /dev/sdc read-write (Read-only file system). /dev/sdc has been opened read-only.
Error: Can't write to /dev/sdc, because it is opened read-only.
ped_disk_commit() failed

[速腾1994]

because it is opened read-only.

只读了？