Your Toshiba Satellite A100 includes a recovery disc that is used to boot the laptop, if it has suffered a serious software problem, and then reinstall the operating system. In the event that your system needs to be recovered but you can't find the recovery disc, you need not resort to buying another laptop or operating system installation disc. The Satellite A100 has a hidden hard drive partition that contains the recovery utility. You can access the partition without the recovery disc and restore the laptop's operating system manually.
Transfer the personal files you need from the Toshiba Satellite A100's hard drive to a storage device such as a rewritable DVD or USB memory stick. Restart the A100's operating system.
Press down and hold the "0" key until the "Toshiba Hard Drive Recovery Utility" menu appears on the screen. Press the "1" key to access the "Restore Original Factory Image" option.
Click "Yes" to begin the recovery process on your Toshiba Satellite A100. Wait for the process to finish and then press "Enter" to restart the laptop's operating system.
Use the prompts that appear to set up a new user name for your operating system's profile. Click the drop-down menus and select the time zone and date information.
Follow the prompts on the screen to set up your Internet connection and finish recovering the Toshiba Satellite A100 laptop.
Before starting the recovery process, you may want to download the installation files for any security software you use, such as your firewall or antivirus program. Save the installation file to the storage device you are using for your other personal files. After completing the recovery process, transfer the installation files back to the Satellite A100's hard drive and install them before accessing the Internet.