[求助]fdisk 不成功

[marathoner]

fdisk /dev/sdb

Command (m for help): p

Disk /dev/sdb: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 19 152586 83 Linux
/dev/sdb2 20 32 104422+ 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 16: 设备或资源忙.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.


然后
partprobe
Warning: Unable to open /dev/hda read-write (Read-only file system). /dev/hda has been opened read-only.


这是啥原因阿？

请指教～

[marathoner]

原来是因为/dev/sdb1,已经被mount过了，umount /dev/sdb1后，就可以fdisk了。