There’s one big event that can trigger an overwhelming sense of dread when you’re installing an OS on a friend or family member’s PC: data loss. It’s bad enough when it happens to your own data, but when it’s someone else’s machine, the feeling can be unbearable.
I know because that’s the situation I found myself in during a recent family reunion in upstate New York. I was attempting to install Ubuntu 16.04 alongside a Windows 7 installation on my mother's laptop. And not thinking (I shamefully admit), I failed to make a backup of her data before I resized her Windows partition. It wasn’t until I tried to boot back into Windows 7 that realized what I had done.
After a mild panic attack and several assurances to her that I could fix it, I found the program that saved my butt: TestDisk. TestDisk has been around for a while, and was even reviewed by PCWorld in 2011. It works like a charm, but does so without the aid of a flashy GUI. It turns out it’s in the official Ubuntu repositories that ship with Ubuntu 16.04. (It’s also available in the Arch Linux Extra repo.)
TestDisk to the rescue
TestDisk’s website says the program is designed “to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software: certain types of viruses or human error (such as accidentally deleting a Partition Table).” One thing to understand about storage drives is that when you delete a file or partition table, the data is still on the disk. The deletion just removes the pointer to the data, allowing the the OS to write over those blocks. (You can delete the data itself too, but usually this requires deliberate deletion with tools like shred.)
How To Install Centos Os
You can use TestDisk as a rescue for Windows or Linux partitions, but you’ll need an Ubuntu live USB drive so you can boot into a separate environment on your PC, and then retrieve the lost files. With Ubuntu running, install TestDisk using the command sudo apt-get install testdisk. You’ll need to run it with administrator privileges: sudo testdisk.
On the first run, TestDisk will ask if you want to start a new log file. (You probably do.) From there, the program will look for any drives automatically. If no drives are found, you’ll need to specify the block device as an argument to TestDisk, e.g.: sudo testdisk /dev/sda. If you’re unsure about where the drives you’re looking to recover are located, use the command lsblk to get more information.
Once you see the drives, TestDisk will try to automatically detect the partitions, including those that have been deleted. TestDisk will also look for file entries automatically, though damaged or deleted partitions will require a deeper scan. The deeper scan will take some time, since TestDisk will read the entire partition, block by block. Once the scan is done and you see all the files, you can copy the files to backup media (like you, err, I, should
It’s important to note that TestDisk only takes care of software faults in a drive’s data, and will not save you in the event of physical failure. As always, you really should keep a good backup of your data. With a complete and current backup, you’re always free to wipe a drive if anything goes wrong.
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This post will guide you a step-by-step installation of Community ENTerprise Operating System 6.3 (CentOS) with screenshots. Less than three weeks after the release of Red Hat Enterprise Linux (RHEL) 6.3. The CentOS Project has released its clone of RHEL 6.3 distribution on 09 July 2012.
CentOS 6.3 Features
CentOS Linux Distribution contains some new exciting features like.
- OpenOffice 3.2 has been replaced by LibreOffice 3.4, if you update from previous version of CentOS 6 using ‘yum update’ and have openoffice installed, the update will automatically remove openoffice and install libreoffice.
- Many drivers have been updated and improved in virtulisation.
- Upstream has deprecated the Matahari API for operating system management has been deprecated, and there’s new tools for moving physical and virtual machines into Virtual KVM machine instances. These new tools from Red Hat are virt-p2v and virt-v2v for physical-to-virtual and virtual-to-virtual migration, respectively.
Direct Download CentOS 6.3 DVD ISO Images
Torrent Download CentOS 6.3 DVD ISO Images
CentOS 6.3 Step by Step Graphical Installation Guide
Boot Computer with CentOS 6.3 OS Installation CD/DVD.
1. Select Install or Upgrade existing system options.
2. Choose skip media test as it may take long time to check media.
Skip CentOS 6.3 Media Test
3. CentOS 6.3 Welcome Screen press Next.
4. Language Selection.
CentOS 6.3 Language Selection
5. Select appropriate Keyboard.
6. Select Basic Storage Device if your hard drive is attached locally.
CentOS 6.3 Storage Device Selection
7. You may get Storage Device warning, you can click Yes, discard any data button to Continue.
8. Give a Hostname to the server and click on Configure Network button if you want to configure network while installation.
CentOS 6.3 Hostname and Network Setup
9. Click Wired tab and click on Add button.
10. Select Connect Automatically, go to ipv4 settings tab and select Method and select Manual in drop down. Click on Add tab to fill address box with IP Address, Netmask, Gateway and DNS Server. Here I’m using IP Address 192.168.1.6 and DNS Server is 4.2.2.2 for demo. This IP Address may vary in your environment.
CentOS 6.3 Network Configuration
11. Select Time Zone.
12. Give a root password.
CentOS 6.3 root Password
13. Select appropriate partitioning as per your requirement.
14. Verify filesystem. Here, you can edit filesystem If you want.
CentOS 6.3 Partition Verify
15. Disk Format Warning, click on Format.
16. Select Write Changes to disk.
CentOS 6.3 Disk Changes
17. Hard Drive is Formatting.
18. Here, you can give Boot loader Password for better security.
CentOS 6.3 Boot Loader Password
19. Select the applications you want to install, you can choose Customize now and click Next.
20. Select the applications you want to install and click Next.
CentOS 6.3 Packages Selection
21. Installation started, this may take several minutes as per selection of packages.
22. Installation completed, Please remove CD/DVD and reboot system.
CentOS 6.3 Installation Completes
23. Welcome to CentOS 6.3 Login Screen.
24. CentOS 6.3 Desktop Screen.
CentOS 6.3 Desktop Screen
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