OptiPlex 7040 – 2015 (6th generation Intel Skylake) UEFI BIOS with Secure Boot.OptiPlex 7020 – 2014 (4th generation Intel Haswell) UEFI BIOS with Secure Boot.OptiPlex 3010/7010 – 2012 (3rd generation Ivy Bridge) UEFI BIOS with Secure Boot (only with the latest UEFI BIOS Update).OptiPlex 390/790 – 2011 (2nd generation Sandy Bridge) UEFI BIOS – No Secure Boot, there is no option for Legacy ROMs as these are always Enabled.The UEFI BIOS and GPT partition scheme should be used where possible with Windows 7 64 Bit. You may or may not have these technologies depending on the age of your system. Part 1: Determining whether your System Supports UEFI and Secure Boot Dell Systems Older than 2010 – Legacy Preboot Diagnostics (Bootable USB)Īnd attempt data recovery to an external hard drive using Fedora before proceeding:.If you have not backed up your data and you have came to this guide because your system cannot boot. Many PCs still ship with text-mode UEFI settings interfaces that look and work like an old BIOS setup screen.This will perform a clean installation of Windows 7 64 Bit removing all data on your system's drives. It also means that UEFI setup screens can be slicker than BIOS settings screens, including graphics and mouse cursor support. UEFI can run in 32-bit or 64-bit mode and has more addressable address space than BIOS, which means your boot process is faster. It also boots in a more standardized way, launching EFI executables rather than running code from a drive’s master boot record. That’s because UEFI uses the GPT partitioning scheme instead of MBR. That’s roughly three times the estimated size of all the data on the Internet. The UEFI firmware can boot from drives of 2.2 TB or larger-in fact, the theoretical limit is 9.4 zettabytes. This new standard avoids the limitations of the BIOS. RELATED: What's the Difference Between GPT and MBR When Partitioning a Drive?

You need to buy new hardware that supports and includes UEFI, as most new computers do. Most UEFI implementations provide BIOS emulation so you can choose to install and boot old operating systems that expect a BIOS instead of UEFI, so they’re backwards compatible. UEFI replaces the traditional BIOS on PCs. There’s no way to switch from BIOS to UEFI on an existing PC. How UEFI Replaces and Improves on the BIOS

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