Linux格式化扩展分区时会报错，因为Linux扩展分区格式化无意义，它是为logical
partition服务的，它们大小一样。在一块硬盘里你最多只能创造four
partiton，包括主分区与expand分区，而一个expand分区可以创造去多个logical
partition，是在
新浪博客
logical partition使用space的。此时，为了解决问题，可以在扩展分区上创建主分区（p）或逻辑分区（l）
以下演示出错解决过程：
1、创建扩展分区
[root@localhost tmp]# fdisk /dev/sda
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): n
First cylinder (4106-4178, default 4106):
Using default value 4106
Last cylinder, +cylinders or +size{K,M,G} (4106-4178, default 4178): +100M
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)
Syncing disks.
[root@localhost tmp]# fdisk -l
Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003d455
Device Boot Start End Blocks Id System
/dev/sda1 * 1 128 1024000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 128 2040 15360000 83 Linux
/dev/sda3 2040 3825 14336000 83 Linux
/dev/sda4 3825 4178 2833408 5 Extended
/dev/sda5 3825 4106 2252800 82 Linux swap / Solaris
/dev/sda6 4106 4119 109964 83 Linux
2、格式化磁盘分区
[root@localhost ~]# mount /dev/sda6 /data
mount: you must specify the filesystem type
显示分区未格式化
[root@localhost ~]# mkfs -t ext3 -c /dev/sda6
mke2fs 1.41.12 (17-May-2010)
mkfs.ext3: inode_size (128) * inodes_count (0) too big for a
filesystem with 0 blocks, specify higher inode_ratio (-i)
or lower inode count (-N).
3、格式化扩展分区报错解决
格式磁盘时发现如下错误，原因是扩展分区无法格式化，
解决方法是在扩展分区上创建主分区（p）或逻辑分区（l）
[root@localhost ~]# fdisk /dev/sda6
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xcbd45cde.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): p
Disk /dev/sda6: 112 MB, 112603136 bytes
255 heads, 63 sectors/track, 13 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcbd45cde
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-13, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-13, default 13): 13M
Command (m for help): P
Disk /dev/sda6: 112 MB, 112603136 bytes
255 heads, 63 sectors/track, 13 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcbd45cde
Device Boot Start End Blocks Id System
/dev/sda6p1 1 13 104391 83 Linux
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 22: 无效的参数.
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)
Syncing disks.
此处要重启使生效，也可以使用partprobe命令
[root@localhost ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (设备或资源忙). As a result, it may not reflect all of your changes until after reboot.
Warning: 无法以读写方式打开 /dev/sr0 (只读文件系统)。/dev/sr0 已按照只读方式打开。
Warning: 无法以读写方式打开 /dev/sr0 (只读文件系统)。/dev/sr0 已按照只读方式打开。
Error: 无效的分区表 - /dev/sr0 出现递归分区。
[root@localhost ~]# fdisk -l
Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003d455
Device Boot Start End Blocks Id System
/dev/sda1 * 1 128 1024000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 128 2040 15360000 83 Linux
/dev/sda3 2040 3825 14336000 83 Linux
/dev/sda4 3825 4178 2833408 5 Extended
/dev/sda5 3825 4106 2252800 82 Linux swap / Solaris
/dev/sda6 4106 4119 109964 83 Linux
[root@localhost ~]# mkdir /data
再次格式化，显示格式化成功。
[root@localhost ~]# mkfs.ext3 /dev/sda6
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=1024 (log=0)
分块大小=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
27552 inodes, 109964 blocks
5498 blocks (5.00%) reserved for the super user
第一个数据块=1
Maximum filesystem blocks=67371008
14 block groups
8192 blocks per group, 8192 fragments per group
1968 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
正在写入inode表: 完成
Creating journal (4096 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
4、再次挂载磁盘分区，挂载成功
[root@localhost ~]# mount /dev/sda6 /data
[root@localhost ~]# df -hT
[root@localhost /]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 15G 8.4G 5.9G 59% /
/dev/sda1 ext4 969M 54M 865M 6% /boot
/dev/sda3 ext4 14G 525M 13G 5% /home
/dev/sr0 iso9660 1.8G 1.8G 0 100% /mnt/iso
share vboxsf 222G 93G 129G 42% /mnt/share
/dev/sda6 ext3 104M 5.7M 93M 6% /data
以下演示出错解决过程：
1、创建扩展分区
[root@localhost tmp]# fdisk /dev/sda
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): n
First cylinder (4106-4178, default 4106):
Using default value 4106
Last cylinder, +cylinders or +size{K,M,G} (4106-4178, default 4178): +100M
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)
Syncing disks.
[root@localhost tmp]# fdisk -l
Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003d455
Device Boot Start End Blocks Id System
/dev/sda1 * 1 128 1024000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 128 2040 15360000 83 Linux
/dev/sda3 2040 3825 14336000 83 Linux
/dev/sda4 3825 4178 2833408 5 Extended
/dev/sda5 3825 4106 2252800 82 Linux swap / Solaris
/dev/sda6 4106 4119 109964 83 Linux
2、格式化磁盘分区
[root@localhost ~]# mount /dev/sda6 /data
mount: you must specify the filesystem type
显示分区未格式化
[root@localhost ~]# mkfs -t ext3 -c /dev/sda6
mke2fs 1.41.12 (17-May-2010)
mkfs.ext3: inode_size (128) * inodes_count (0) too big for a
filesystem with 0 blocks, specify higher inode_ratio (-i)
or lower inode count (-N).
3、格式化扩展分区报错解决
格式磁盘时发现如下错误，原因是扩展分区无法格式化，
解决方法是在扩展分区上创建主分区（p）或逻辑分区（l）
[root@localhost ~]# fdisk /dev/sda6
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xcbd45cde.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): p
Disk /dev/sda6: 112 MB, 112603136 bytes
255 heads, 63 sectors/track, 13 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcbd45cde
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-13, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-13, default 13): 13M
Command (m for help): P
Disk /dev/sda6: 112 MB, 112603136 bytes
255 heads, 63 sectors/track, 13 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcbd45cde
Device Boot Start End Blocks Id System
/dev/sda6p1 1 13 104391 83 Linux
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 22: 无效的参数.
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)
Syncing disks.
此处要重启使生效，也可以使用partprobe命令
[root@localhost ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (设备或资源忙). As a result, it may not reflect all of your changes until after reboot.
Warning: 无法以读写方式打开 /dev/sr0 (只读文件系统)。/dev/sr0 已按照只读方式打开。
Warning: 无法以读写方式打开 /dev/sr0 (只读文件系统)。/dev/sr0 已按照只读方式打开。
Error: 无效的分区表 - /dev/sr0 出现递归分区。
[root@localhost ~]# fdisk -l
Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003d455
Device Boot Start End Blocks Id System
/dev/sda1 * 1 128 1024000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 128 2040 15360000 83 Linux
/dev/sda3 2040 3825 14336000 83 Linux
/dev/sda4 3825 4178 2833408 5 Extended
/dev/sda5 3825 4106 2252800 82 Linux swap / Solaris
/dev/sda6 4106 4119 109964 83 Linux
[root@localhost ~]# mkdir /data
再次格式化，显示格式化成功。
[root@localhost ~]# mkfs.ext3 /dev/sda6
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=1024 (log=0)
分块大小=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
27552 inodes, 109964 blocks
5498 blocks (5.00%) reserved for the super user
第一个数据块=1
Maximum filesystem blocks=67371008
14 block groups
8192 blocks per group, 8192 fragments per group
1968 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
正在写入inode表: 完成
Creating journal (4096 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
4、再次挂载磁盘分区，挂载成功
[root@localhost ~]# mount /dev/sda6 /data
[root@localhost ~]# df -hT
[root@localhost /]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 15G 8.4G 5.9G 59% /
/dev/sda1 ext4 969M 54M 865M 6% /boot
/dev/sda3 ext4 14G 525M 13G 5% /home
/dev/sr0 iso9660 1.8G 1.8G 0 100% /mnt/iso
share vboxsf 222G 93G 129G 42% /mnt/share
/dev/sda6 ext3 104M 5.7M 93M 6% /data