If you one hardisk crashed and you replaced that hard disk but hard disk not showing in order then follow the bellow steps:-

If you one hardisk crashed and you replaced that hard disk but hard disk not showing in order then follow the bellow steps:-


#sudo fdisk /dev/sda

At the fdisk command prompt: Enter
m (for help)
Next at the prompt: Enter
x (extra functionality – experts only)
f (fix)
w (write to disk and exit)
You may get a warning that devices are in use and the new table will be used at the next boot.

If you want that the Linux Kernel reads the new partition table now , use the following command.

sudo partprobe