Becareful when installing system on existing system

I installing the ubuntu for my friend as following steps:

  1. make the bootable thumb drive from existing ubuntu system
  2. plug the thumb drive to the pc, and restart the computer
  3. press the F12 key
  4. select to boot from USB Storage Drive
  5. booting the ubuntu from USB
  6. select the Install option
  7. re-size the existing partition for installing the ubuntu. This step need to very very very and very careful! it’s very possible to format your existing drive!* Make sure read every single word before you click the “OK” button! I was unexpectedly select the change the existing partition size and select the format as “swap” which should not do like this, so that drive has been re-formatted! But it’s not because of ubuntu not friendly, it does prompt the warning that will ease the data from that drive, but I was too hungry to try to speed up the process, so I select the format as “swap”, then after I click “OK”, then it’s starting re-sizing the drive and formatting the used part as *SWAP*!
  8. lose data from that drive…
  9. start crying…