Ask LH: What Should I Do To My Computer Before I Sell It?

Ask LH: What Should I Do To My Computer Before I Sell It?

Dear Lifehacker, I know I should securely wipe my hard drive before I sell it, but is there anything else I should do before I put it up on eBay? I want to make the transition as smooth as possible. Sincerely, Selling it All

Dear SA,

Selling (or giving away) an old computer is often a little scary. You likely invested a lot of hours into using your computer, and it’s packed full of all your personal stuff. You also want to make sure it’s in tip-top running condition before you sell it off so you can get the most money. Here’s what you need to do.

Step 1: Back Up All Your Files

Dropboxcloud storage serviceback up your data to an external hard drive

If you’re going to go a little while between computers, a cloud backup solution like Crashplan might be a good bet, and it’s very easy to back up and restore your data. Regardless of what method you choose, make sure you run the backup before you do anything else so all your files are up to date.

Step 2: Deauthorise Any Software

Adobe Creative SuiteAmazon’s Kindle Apps

Likewise, it might be a good time to clean up the services you enabled two-factor authentication on. While the chances of someone having your password after you securely delete your hard drive in the next step is slim, it’s a good idea to make the process of someone logging into your accounts impossible from the start.

One last thing to note before we delete everything: if you’re a Mac user running OS X Mountain Lion or OS X Lion, you might need to make your own USB or DVD boot disc so you can easily reinstall the OS in step 4. You can also download and install the OS during the re-installation process, but a physical copy of the OS will put your mind at ease just in case things don’t go as planned.

Step 3: Securely Format Your Hard Drive

We’ve walked you through this process before, and it’s very simple. On Windows, we like the program Darik’s Boot and Nuke to format the hard drive, and on Mac the built-in Disk Utility works great. Photo by Kevin Walter.

Step 4: Reinstall the Operating System

is easy provided you still have your operating system discscan change the settings in your BIOS

Once you’re done reinstalling the operating system, it’s up to you how far into the setup process you want to go. If you’re selling a computer online at a site like eBay, you can stop at the new user creation screen. Just power off your computer when it asks you to create a user account and you’re good to go.

Step 5: Clean it Up

talked about before

Once your computer is cleaned up and it’s looking as good as new, take some great pictures of your computer, and then you’re good to post it online.


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    • I should hope that in 2012 nobody is doing this any more since it offers absolutely zero real security, merely a false sense of security.

      It’s akin to painting your front door the same colour as the rest of the outside of your house, and thinking that nobody will be able find it. Completely useless as a security measure, and an inconvenience for legitimate use.

      Just use WPA2 and you’ll be fine.

  • Wouldn’t it be easier to buy a new hard drive and just install the os. keep the old hard drive as a back up or incase you need to re access any of the information. it would certainly be less time consuming

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