Linux disk partition (2): Delete

Linux disk partition (2): Delete

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Original works, from "Deep Blue blog" blog, welcome to reprint, reprint please be sure to indicate the source (http://blog.csdn.net/huangyanlong ).

Please leave a message or email (hyldba@163.com) indicating that there is an error. Thank you very much.

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Linux hard disk partition (2): Delete

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Example: umount sdb1

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[root@hyl /]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda1             9.7G  5.4G  3.9G  59% //dev/sda3              35G   17G   17G  50% /hometmpfs                1006M     0 1006M   0% /dev/shm/dev/sdb1             1.9G   35M  1.8G   2% /data1[root@hyl /]# umount /data1[root@hyl /]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda1             9.7G  5.4G  3.9G  59% //dev/sda3              35G   17G   17G  50% /hometmpfs                1006M     0 1006M   0% /dev/shm[root@hyl /]# fdisk -lDisk /dev/sda: 53.6 GB, 53687091200 bytes255 heads, 63 sectors/track, 6527 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1        1305    10482381   83  Linux/dev/sda2            1306        1827     4192965   82  Linux swap / Solaris/dev/sda3            1828        6527    37752750   83  LinuxDisk /dev/sdb: 10.7 GB, 10737418240 bytes255 heads, 63 sectors/track, 1305 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1         250     2008093+  83  Linux/dev/sdb2             251         500     2008125   83  Linux/dev/sdb3             501         750     2008125   83  Linux/dev/sdb4             751        1305     4458037+   5  Extended/dev/sdb5             751         875     1004031   83  Linux/dev/sdb6             876        1000     1004031   83  Linux/dev/sdb7            1001        1305     2449881   83  Linux

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Operation on the second disk (I .e./dev/sdb)
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[root@hyl /]# fdisk /dev/sdbThe number of cylinders for this disk is set to 1305.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): mCommand 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): pDisk /dev/sdb: 10.7 GB, 10737418240 bytes255 heads, 63 sectors/track, 1305 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1         250     2008093+  83  Linux/dev/sdb2             251         500     2008125   83  Linux/dev/sdb3             501         750     2008125   83  Linux/dev/sdb4             751        1305     4458037+   5  Extended/dev/sdb5             751         875     1004031   83  Linux/dev/sdb6             876        1000     1004031   83  Linux/dev/sdb7            1001        1305     2449881   83  Linux</span>

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Delete partitions: sdb1 and others
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Command (m for help): d -- enter the DELETE Command Partition number (1-7): 1 -- enter the deleted Partition number Command (m for help ): p -- print Partition Table Disk/dev/sdb: 10.7 GB, 10737418240 bytes255 heads, 63 sectors/track, 1305 cylindersUnits = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sdb2 251 500 2008125 83 Linux/dev/sdb3 501 750 2008125 83 Linux/dev/sdb4 751 1305 4458037 + 5 Extended/dev/sdb5 751 875 83 Linux/dev/sdb6 876 1000 1004031 83 Linux/dev/sdb7 1001 1305 2449881 83 Linux -- we can see that sdb1 has been deleted -- Similarly, delete other partitions Command (m for help): dPartition number (1-7): 2 Command (m for help): dPartition number (1-7): 3 Command (m for help): dPartition number (1-7): 4 Command (m for help): p Disk/dev/sdb: 10.7 GB, 10737418240 bytes255 heads, 63 sectors/track, 1305 cylindersUnits = cylinders of 16065*512 = 822528 0 bytes Device Boot Start End Blocks Id SystemCommand (m for help): w -- save and quit The partition table has been altered! Calling ioctl () to re-read partition table. Syncing disks. -- Now you can remove the disk.

**************************************** ******************************** ****************

Original works, from "Deep Blue blog" blog, welcome to reprint, reprint please be sure to indicate the source (http://blog.csdn.net/huangyanlong ).

Please leave a message or email (hyldba@163.com) indicating that there is an error. Thank you very much.

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