![]() In this mode, UEFI features are enabled, and things such as Secure Boot will still work. CSM stands for compatibility support mode. If you are using Windows images, you may need to build a new image. However, the operating system has to be UEFI aware - for example, Windows XP cannot boot if UEFI is enabled in the BIOS - and the disk needs to be partitioned using a newer method known as GPT, as opposed to the older MBR (master boot record) method.Īdditionally, you will usually need to reinstall or redeploy a system if you change to UEFI mode after original installation. ![]() ![]() For example, bootable devices greater than 2TB in size are supported. The way the system firmware interacts with the operating system is different and more flexible. UEFI boot is an alternative to the legacy method of booting an operating system, known as the " BIOS". This gives the system administrator awareness of a problem the system can be cleaned and then restored to normal service, protecting the users data. In other words, if the operating system loader is damaged by a malicious attack, such as by a virus or malware, the system can detect this and prevent the system from booting. Secure Boot uses a signature to ensure that the operating system loader is trusted. Secure Boot and UEFI boot are two technologies that go hand in hand to enhance the security and capabilities of a modern PC system.
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