在使用fdisk創建分區時，我們會使用partprobe命令可以使kernel重新讀取分區信息，從而避免重啟系統，但是有時候會遇到下面錯誤信息“Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.”，如下所示：
[root@getlnx14test scsi_device]# fdisk /dev/sde
The number of cylinders for this disk is set to 19581.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/sde: 161.0 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sde1 1 15665 125829081 5 Extended
/dev/sde2 15666 17231 12578895 83 Linux
/dev/sde5 1 15665 125829049+ 83 Linux
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (17232-19581, default 17232): 17232
Last cylinder or +size or +sizeM or +sizeK (17232-19581, default 19581):
Using default value 19581
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: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@getlnx14test scsi_device]# partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
[root@getlnx14test scsi_device]#
其實不要擔心和緊張， /dev/sr0是你的光驅（CD Drive），因為你運行partprobe時沒有指定設備，所以它會檢查所有的塊設備（block devices），由於光驅是read-only，所以報上述告警信息，其實避免這個錯誤也很簡單，你只需要使用partprobe檢查、掃描指定設備即可。如下所示
[root@getlnx14test scsi_device]# partprobe /dev/sde
[root@getlnx14test scsi_device]#
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